Demagnetisation of Permanent Magnets in Electrical Machines
... demagnetisation by shifting the whole BH-curve. High temperatures in machines can be caused by some hazard situation, by loss of cooling or by some non-usual loading. In fast rotating machines with narrow air gaps, the eddy currents can cause a rise of temperature in permanent magnets because most P ...
... demagnetisation by shifting the whole BH-curve. High temperatures in machines can be caused by some hazard situation, by loss of cooling or by some non-usual loading. In fast rotating machines with narrow air gaps, the eddy currents can cause a rise of temperature in permanent magnets because most P ...
Lab 6 Magnetic Fields
... We will examine and compare the magnetic fields produced by a bar magnet (permanent magnet) and a solenoid (electromagnet). Equipment Power supply, DMM, rheostat, solenoid, magnetic field sensor, bar magnet, ruler and meter stick. Background All magnets, whether permanent or electromagnetic, have tw ...
... We will examine and compare the magnetic fields produced by a bar magnet (permanent magnet) and a solenoid (electromagnet). Equipment Power supply, DMM, rheostat, solenoid, magnetic field sensor, bar magnet, ruler and meter stick. Background All magnets, whether permanent or electromagnetic, have tw ...
Experiment 1: Thomson surrounded the cathode ray tube with a
... field and had sensors to measure small electrical charges (electrometers). The electrometers measured no change with magnets on the tube, indicating that the cathode rays had been bent by the magnetic field and therefore had negative charge. Diagram of cathode ray tube (with magnets) ...
... field and had sensors to measure small electrical charges (electrometers). The electrometers measured no change with magnets on the tube, indicating that the cathode rays had been bent by the magnetic field and therefore had negative charge. Diagram of cathode ray tube (with magnets) ...
Word
... to ionization of atoms in the atmosphere when they collide with high speed charged particles. The free B electrons resulting from the collisions recombine with ionised atoms, losing energy in the process which is emitted as light of the auroras. d. Near the poles the field lines are denser, hence th ...
... to ionization of atoms in the atmosphere when they collide with high speed charged particles. The free B electrons resulting from the collisions recombine with ionised atoms, losing energy in the process which is emitted as light of the auroras. d. Near the poles the field lines are denser, hence th ...
![L 29 Electricity and Magnetism [6] Laws of Magnetism The electric](http://s1.studyres.com/store/data/015457348_1-45ec1c6d8804a0bbd57ecd8a52999a34-300x300.png)
L 29 Electricity and Magnetism [6] Laws of Magnetism The electric
... 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 ...
Science Circus Africa Teacher Booklet -Magnets-
... The magnets attract the balls increasing their speed – this moving energy is passed through the balls one after another. At the start, the iron balls are attracted to the magnets holding them in place. As you roll the ball towards the magnet, this ball is also attracted. This makes it speed up (acce ...
... The magnets attract the balls increasing their speed – this moving energy is passed through the balls one after another. At the start, the iron balls are attracted to the magnets holding them in place. As you roll the ball towards the magnet, this ball is also attracted. This makes it speed up (acce ...
Problems for week 8
... Consider the mass spectrometer shown schematically in Figure 29.24. The magnitude of the electric field between the plates of the velocity selector is 2 500 V/m, and the magnetic field in both the velocity selector and the deflection chamber has a magnitude of 0.035 0 T. Calculate the radius of the ...
... Consider the mass spectrometer shown schematically in Figure 29.24. The magnitude of the electric field between the plates of the velocity selector is 2 500 V/m, and the magnetic field in both the velocity selector and the deflection chamber has a magnitude of 0.035 0 T. Calculate the radius of the ...
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.