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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 in the figure. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region |
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Answer» is ZERO `oint vecE.vec(dl) = (dphi)/(dt)` or `E(2pir) =d/(dt) (vecB.vecA)` `2pirE=pia^2 ((dB)/(dt))cos 0^@` or `E=a^2/(2r) (dB)/(dt)` or `E prop 1/r` 
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