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A unifrom magnetic field B points vertically up and is slowly changed in magnitude, but not in direction. the rate of change of the magnetic field is `alpha` .A conducting ring of radius r and resistance R is held perpendicular to the megnetic field, and is totally inside it. The induced current in the ring isA. zeroB. `(2pieB)/(R)`C. `(ralpha)/(R)`D. `(pir^(2)alpha)/(R)` |
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Answer» Correct Answer - D The magnitude of the induced emf in the ring is `|epsi|=(dphi)/(dt)=(d)/(dt)(BA)=A(dB)/(dt)=pir^(2)alpha` The induced current in the ring. `I=(|epsi|)/(R)=(pir^(2)alpha)/(R)` |
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