4.5. Electromagnetic effects
A subsection of Physics, 0625, through 4. Electricity and magnetism
Listing 10 of 622 questions
An electrical conductor is placed between the poles of a magnet as shown in . electrical conductor N pole S pole State a material from which an electrical conductor can be made. A centre-zero meter measures the electromotive force (e.m.f.) across the conductor. State the unit of e.m.f. unit = State what, if anything, is shown by the centre-zero meter when the conductor is moved. • horizontally, from side-to-side, between the poles of the magnet, • vertically, up-and-down, between the poles of the magnet. State two factors that affect the size of the e.m.f. across the conductor.
0625_m17_qp_32
THEORY
2017
Paper 3, Variant 2
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A teacher demonstrates electromagnetic induction using the apparatus shown in . centre-zero millivoltmeter N S magnet coil spring The teacher pulls the magnet down until one end is inside the coil. The teacher then releases the magnet. The magnet moves up and down repeatedly. As it moves, one end of the magnet enters and leaves the coil. Describe and explain the readings on the centre-zero millivoltmeter as the magnet enters and leaves the coil. shows a system for transmitting electricity from a power station. homes power station X Y pylon 240 V 22 000 V 132 000 V State the name of the device used in X and the name of the device used in Y. X Y
0625_m18_qp_32
THEORY
2018
Paper 3, Variant 2
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11 An experimenter uses a length of wire ABC in an attempt to demonstrate electromagnetic induction. The wire is connected to a sensitive millivoltmeter G. A B C G N S Using the arrangement in , the experimenter finds that she does not obtain the expected deflection on G when she moves the wire ABC down through the magnetic field. Explain why there is no deflection shown on G. What change should be made in order to observe a deflection on G? Name one device that makes use of electromagnetic induction.
0625_s08_qp_2
THEORY
2008
Paper 2, Variant 0
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Questions Discovered
622