Questions
Shown in the figure is a circular loop of radius r and resistance R. A variable magnetic field of induction 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=e2R;e=−ddt(BA)=AddtBoe−t=ABoe−t⇒P=1RABoe−t2=A2Bo2e−2tRAt the time of starting t = 0 so P=A2Bo2R⇒P=(πr2)2Bo2R=Bo2π2r4RTalk to our academic expert!
Similar Questions
Figure shows three regions of magnetic field each of area A, and in each region, magnitude of magnetic field decreases at a constant rate .It is the induced electric field, then the value of the line integral along the given loop is equal to
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