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Investigating Electrostatics Recount what you do to charge a Perspex® (acrylic plastic) rod using a silk cloth. ...................................................................................................................................... ...................................................................................................................................... Explain how the Perspex rod becomes charged when rubbed with silk. ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... Charge one end of a Perspex rod and balance it on a watch glass. Charge the end of another Perspex rod and bring it near the charged end of the rod on the watch glass. Vary the distance between the rods when you carry out this investigation. (a)Describe your observations. (b) Explain your observations ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... Charge one end of a Perspex® (acrylic plastic) rod and balance it on a watch glass. Charge the end of an ebonite rod and bring it near the charged end of the rod on the watch glass. (a)Describe your observations. (b) Explain your observations ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... Tear up some paper so that you have about 10 pieces less than 5 mm across and place them on the desk together. Charge the end of a Perspex rod and bring it near to the paper. (a)Describe your observations. (b) Explain your observations ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... Investigating Electrostatics ELECTROSCOPES – OPTIONAL FOR ADVANCED THINKERS! Charge a Perspex rod and place on top of an uncharged electroscope. (a)Describe your observations. (b) Explain your observations ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... Place a charged Perspex rod on top of the electroscope. Charge another Perspex rod and bring it near, but not touching, the rod on the electroscope. (a)Describe your observations. (b) Explain your observations ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... Place a charged Perspex rod on top of the electroscope. Charge an ebonite rod and bring it near, but not touching, the rod on the electroscope. (a)Describe your observations. (b) Explain your observations ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... Turn on a tap so that there is a thin stream of water flowing smoothly from the tap. Charge a Perspex rod and bring it slowly near to the stream of water, being careful not to wet the rod. Repeat the process with a charged ebonite rod. (a)Describe your observations. (b) Explain your observations ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... Investigating Electrostatics Electric Fields Draw a positive charge in the centre of the adjacent space. Use arrows to show the direction of the force on a positive charge placed at various points around this charge. Explain your diagram. ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... Draw a positive charge in the centre of the adjacent space. Draw the electric field pattern surrounding this charge. State how the electric field pattern around a negative charge would be different from this. ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... Draw a positive charge above a negative charge in the centre of the adjacent space. Draw the electric field pattern surrounding these charges. ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... Draw the electric field pattern surrounding the positive charges in the adjacent diagram. ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... Investigating Electrostatics Recount what you do to charge a Perspex® (acrylic plastic) rod using a silk cloth. A Perspex rod can be charged by rubbing it vigorously with a silk cloth. Explain how the Perspex® rod becomes charged when rubbed with silk. The Perspex rod becomes positively charged because the friction between it and the silk cloth causes electrons to be transferred from the rod to the cloth. If the rod was initially neutral, removing electrons from it leaves it having more protons than electrons. Since the charge on an electron and a proton are equal and opposite, the greater number of protons on the rod leaves it with a net positive charge. Charge one end of a Perspex® rod and balance it on a watch glass. Charge the end of another Perspex® rod and bring it near the charged end of the rod on the watch glass. Vary the distance between the rods when you carry out this investigation. (a)Describe your observations. (b) Explain your observations (a) The rod on the watch glass moves away from the rod brought near to it. The distance between the rods when this occurred was about 2 centimetres. The closer the rod being held was brought to the rod on the watch glass, the more quickly it moved away. (b) Both rods have a positive charge. Because like charges repel each other, the rod on the watch glass experiences a force that causes it to move away from the rod being held. It was also observed that the charged rod attracted the uncharged end of the rod on the watch glass towards it. Now complete the sections below using the above information as a model. Charge one end of a Perspex® (acrylic plastic) rod and balance it on a watch glass. Charge the end of an ebonite rod and bring it near the charged end of the rod on the watch glass. (a)Describe your observations. (b) Explain your observations ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... Tear up some paper so that you have about 10 pieces less than 5 mm across and place them on the desk together. Charge the end of a Perspex® rod and bring it near to the paper. (a)Describe your observations. (b) Explain your observations ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ......................................................................................................................................
