SA1 REVISION WORKSHEET 3
... 1. What is the frequency of an alternating current if its direction changes after 0.01S? 2. How can it be shown that a magnetic field at a point near a wire related to the strength of the electric current flowing in a wire? 3. Name the physical quantity whose SI unit is Wb-m2. I sit a scalar quantit ...
... 1. What is the frequency of an alternating current if its direction changes after 0.01S? 2. How can it be shown that a magnetic field at a point near a wire related to the strength of the electric current flowing in a wire? 3. Name the physical quantity whose SI unit is Wb-m2. I sit a scalar quantit ...
21.1 Magnets & Magnetic Fields
... conductor? Conductors are materials through which charge can flow easily (metal wires) Voltage is induced in a conductor by a changing ...
... conductor? Conductors are materials through which charge can flow easily (metal wires) Voltage is induced in a conductor by a changing ...
922
... (a) It becomes four times larger. (b) It becomes twice as large. (c) It is unchanged. (d) It becomes one-half as large. (e) It becomes one-fourth as large. (ii) What happens to the field if instead the length of the solenoid is doubled, with the number of turns remaining the ...
... (a) It becomes four times larger. (b) It becomes twice as large. (c) It is unchanged. (d) It becomes one-half as large. (e) It becomes one-fourth as large. (ii) What happens to the field if instead the length of the solenoid is doubled, with the number of turns remaining the ...
L 29 Electricity and Magnetism
... Îmagnetic field lines are always closed loops – no isolated magnetic poles • permanent magnets: the currents are atomic currents – due to electrons spinning in atomsthese currents are always there • electromagnets: the currents flow through wires and require a power source, e.g. a battery ...
... Îmagnetic field lines are always closed loops – no isolated magnetic poles • permanent magnets: the currents are atomic currents – due to electrons spinning in atomsthese currents are always there • electromagnets: the currents flow through wires and require a power source, e.g. a battery ...
Magnets
... 1 A metal that is strongly attracted to a magnet is called ____. 2 Steel is an example of a ferromagnetic material. -------3 Every magnet has ___ where the attraction is strongest. 4 The rule for magnetic poles is : “ like poles ___; opposite poles ___.” 5 Earth has two magnetic poles. 6 Earth’s geo ...
... 1 A metal that is strongly attracted to a magnet is called ____. 2 Steel is an example of a ferromagnetic material. -------3 Every magnet has ___ where the attraction is strongest. 4 The rule for magnetic poles is : “ like poles ___; opposite poles ___.” 5 Earth has two magnetic poles. 6 Earth’s geo ...
magnet
... The earth's magnetic field is just like the field of any magnet - only LARGER and STRONGER. A compass is simply another magnet. And the principles of attraction and repulsion govern the earth magnet and the compass magnet. The earth magnet is considered stationary. Therefore, the compass magnet's no ...
... The earth's magnetic field is just like the field of any magnet - only LARGER and STRONGER. A compass is simply another magnet. And the principles of attraction and repulsion govern the earth magnet and the compass magnet. The earth magnet is considered stationary. Therefore, the compass magnet's no ...
9.5
... magnets, the permanent ones (such as those on your fridge) stick around for. While they may not last forever, you often have to go to some effort to demagnetize them. Permanent magnets all belong to a class of materials referred to as ferromagnetic. The other major difference between permanent and t ...
... magnets, the permanent ones (such as those on your fridge) stick around for. While they may not last forever, you often have to go to some effort to demagnetize them. Permanent magnets all belong to a class of materials referred to as ferromagnetic. The other major difference between permanent and t ...
Magnetism
... force results from charged particles. Magnetic force results from moving charges. Force of magnetic field on the charge ...
... force results from charged particles. Magnetic force results from moving charges. Force of magnetic field on the charge ...
Slide 1 - Cobb Learning
... What is an Electromagnet? When an electric current is passed through a coil of wire wrapped around a metal core, a very strong magnetic field is produced. This is called an electromagnet. The more coils wrapped around the core, the stronger the magnetic field that is produced. This stronger mag ...
... What is an Electromagnet? When an electric current is passed through a coil of wire wrapped around a metal core, a very strong magnetic field is produced. This is called an electromagnet. The more coils wrapped around the core, the stronger the magnetic field that is produced. This stronger mag ...
activity write up
... Ask questions to determine cause and effect relationships of electric or magnetic interactions between two objects not in contact with each other. [Clarification Statement: Examples of an electric force could include the force on hair from an electrically charged balloon and the electrical forces be ...
... Ask questions to determine cause and effect relationships of electric or magnetic interactions between two objects not in contact with each other. [Clarification Statement: Examples of an electric force could include the force on hair from an electrically charged balloon and the electrical forces be ...
Superconducting magnet
A superconducting magnet is an electromagnet made from coils of superconducting wire. They must be cooled to cryogenic temperatures during operation. In its superconducting state the wire can conduct much larger electric currents than ordinary wire, creating intense magnetic fields. Superconducting magnets can produce greater magnetic fields than all but the strongest electromagnets and can be cheaper to operate because no energy is dissipated as heat in the windings. They are used in MRI machines in hospitals, and in scientific equipment such as NMR spectrometers, mass spectrometers and particle accelerators.