Questions
The current in a coil decreases from 1 A to 0.2 A in 10 s. Calculate the coefficient of self-inductance, if induced emf is 0.4 volt.
detailed solution
Correct option is A
e=-Ldidt⇒0.4=-L(0.2-1)10 ⇒L=5HTalk 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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