Questions
The back e.m.f. induced in a coil, when current changes from 1 ampere to zero in one millisecond, is 4 volts. The self-inductance of the coil is
detailed solution
Correct option is D
e=-Ldidt; But e=4 V and didt=0-110-3=-1/10-3∴ -110-3(-L)=4=L=4×10-3HTalk 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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