Questions
Shown in the figure is a circular loop of radius r and resistance R. A variable magnetic field of induction B = B0e-t is established inside the coil. If the key (K) is closed, the electrical power developed right after closing the switch is equal to
detailed solution
Correct option is D
P=ε2R;ε=−ddt(BA)=-AddtBoe−t=ABoe−t⇒P=1RABoe−t2=A2Bo2e−2tRAt the time of starting t=0 so P=A2Bo2R⇒P=πr22Bo2R=Bo2π2r4RTalk to our academic expert!
Similar Questions
Statement-1: Time dependent magnetic field generates an induced electric filed.
Statement-2: Direction of electric filed generated from time variable magnetic field does not obey Lenz’s Law
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