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Q.

An average induced e.m.f. of I V appears in a coil when the current in it is changed from 10 A in one direction to 10 A in opposite direction in 0.5 s.
Self-inductance of the coil is

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a

75 mH

b

100 mH

c

25 mH

d

50 mH

answer is A.

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Detailed Solution

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| e |=L didt⇒1=L × {10−(−10)}0.5

⇒L=25mH

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