GENERATORS
3 marks · NormalDescribe an experiment you could do to show how a voltage is induced in a coil when a magnet moves nearby.
Name the apparatus you would use.
Describe how you would carry out the experiment and what you would observe on the measuring instrument.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) A coil of wire, a bar magnet, a sensitive voltmeter (or galvanometer).
(b) Move the bar magnet into and out of the coil. Observe that the voltmeter (or galvanometer) needle deflects (shows a reading) when the magnet moves, showing a voltage is induced.
Common mistakes: Not naming voltmeter or galvanometer; Not mentioning movement of magnet or what is seen
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Names suitable apparatus: coil, bar magnet, voltmeter or galvanometer.
M1 (b) · 1 mark · Describes moving magnet into/out of coil (or coil moves over magnet).
A1 (b) · 1 mark · States that voltmeter/galvanometer shows a reading when magnet moves.
Worked solution
a. Use a coil of wire, a bar magnet, and a sensitive voltmeter or galvanometer. b. Move the bar magnet quickly into and out of the coil. The voltmeter will show a reading (or the galvanometer needle will deflect) while the magnet moves, showing a voltage is induced.