Questions
When the current in a coil changes from 8 amperes to 2 amperes in 3 x 10-2 second, the e.m.f. induced in the coil is 2 volt. The self-inductance of the coil, in milli-henry is
detailed solution
Correct option is D
e=Ldidt 2=L(8−2)3×10−2=L2×102∴L=22×102=10−2H=10mHTalk 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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