ELECTROMAGNETIC INDUCTION
3 marks · NormalYou are given a coil of wire, a bar magnet, and a sensitive voltmeter.
Describe a practical experiment to show electromagnetic induction and how you would demonstrate that the induced voltage depends on the speed of movement.
Describe how you would set up the apparatus to show an induced voltage.
Describe what you would do to investigate how the induced voltage changes with speed.
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) — · must show Coil connected to voltmeter, Bar magnet moved in or out of coil
(b) — · must show Vary speed of moving magnet, Measure voltage on voltmeter each time, Comment that faster movement increases voltage
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Describes correct practical setup
B1 (b) · 1 mark · Vary speed of magnet
B1 (b) · 1 mark · Observe and record induced voltage each time or relate speed to voltage
Worked solution
a) Connect the ends of the coil to a sensitive voltmeter. Move the bar magnet quickly in and out of the coil to show a voltage is produced.
b) Repeat the experiment, changing the speed of movement each time (move magnet slowly, then quickly). Measure and record the voltage for each speed. The greater the speed of movement, the larger the induced voltage.