MHT CET 2024 Physics question

The magnetic energy in an inductor changes from maximum value to minimum value 5 ms. When connected to an a.c. source, the frequency of the source is

(A)50 HzCorrect
(B)200 Hz
(C)500 Hz
(D)20 Hz

Answer: (A)

Solution

The magnetic energy stored in an inductor is with . It is maximum when and minimum (zero) when . The current goes from its peak value to zero in one quarter of a period, so , giving and $f =

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Question ID VK-092566