Questions
For a coil having L = 2 mH, current flow through it is given by , then the time at which emf becomes zero, is :
detailed solution
Correct option is A
e=LdIdt=0⇒dIdt=0 dIdt=ddtt2e-t=2te-t+t2(-1)e-t=0 ⇒t=2 sTalk 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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