Questions
The current in a coil of inductance 5 H decreases at the rate of 2 A/s. The induced e.m.f. is
detailed solution
Correct option is C
e=-Ldidt; since current decreases, so didt is negative. Hence, e=-5(-2)=+10 VTalk to our academic expert!
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A coil is wound as a transformer of rectangular cross-section. If all the linear dimensions of the transformer are increased by a factor 2 and the number of turns per unit length of the coil remain the same, the self inductance increased by a factor of
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