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Q.

The magnetic field energy in an inductor changes from maximum value to minimum value in 5.0 ms when connected to an AC source. The frequency of the source is

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a

200Hz

b

500Hz

c

20Hz

d

50Hz

answer is B.

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Detailed Solution

magnetic field energy decreases from maximum to minimum the change in phase is π2
ωt=π2; 

2πf×5×10−3=π/2

f=50Hz

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