Questions
A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced
electric field at point P at a distance r from the center of the circular region
detailed solution
Correct option is B
Construct a concentric circle of radius r. The induced electric field (E) at any point on the circle is equal to that at P.For this circle∮ E→.dl→=dφdt=AdBdt⇒ E×(2πr)=πa2⋅dBdt⇒E=a22rdBdt⇒E∝1rTalk to our academic expert!
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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
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