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An a.c. generator consists of a coil of 50 turns and an area 2.5 m^2 rotating at an angular speed of 60 rad s^-1 in a uniform magnetic field of 0.3 T between two fixed pole pieces. What is the flux through the coil, when the current is zero?

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An a.c. generator consists of a coil of 50 turns and an area 2.5 m^2 rotating at an angular speed of 60 rad s^-1 in a uniform magnetic field of 0.3 T between two fixed pole pieces. What is the flux through the coil, when the current is zero?

(a) Maximum

(b) Minimum

(c) Zero

(d) Independent of current

This question was addressed to me in class test.

Enquiry is from AC Generator topic in portion Alternating Current of Physics – Class 12

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The correct choice is (a) Maximum

The explanation: The current is zero when the coil is vertical. In this position, flux through the coil is maximum. On the other hand, the current is maximum, when the coil is horizontal. So, when the current is zero, the flux through the coil is maximum.

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