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• # IMAT 2013 Q55 Physics and Mathematics

• ### Nicolas Sanchez

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June 21, 2021 at 9:46 am 968 Replies 159150 XP
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In an AC (alternating current) generator, a coil of wire rotates in a magnetic field.

[See image below]

Which of the following would change the potential difference measured by the voltmeter in the system above?

1. Use more turns of wire in the coil
2. User thicker wire
3. Change the speed of rotation

A. 3 only

B. 1, 2 and 3

C. 1 and 2 only

D. 2 only

E. 1 and 3 only

• ### MANISH MULCHANDANI

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July 15, 2021 at 11:17 pm 984 Replies 58971 XP
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For this question, you should know the properties of alternating current(AC) Generator.

For 1, Number of turns of wire in the coil is directly proportional to potential difference. So, if number of turns increases/decreases across coil, potential difference will also increases/decreases. Therefore, 1 is correct.

For 2, The potential difference is independent of thickness of wire. So, even if thickness increases/decreases, it won’t change. Therefore, 2 is incorrect.

For 3, Speed of rotation is directly proportional to potential difference. If the speed of rotation increases/decreases, potential difference will also increases/decreases. Therefore, 3 is correct.

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