MemberJune 21, 2021 at 9:46 am968 Replies159150 XPContributions: EnterMedSchool Donor Team Manager VolunteerReputation: Level 7
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?
- Use more turns of wire in the coil
- User thicker wire
- 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
MemberJuly 15, 2021 at 11:17 pm984 Replies58971 XPContributions: VolunteerReputation: Level 6
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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