InterviewSolution
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InterviewSolution
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A conducting circular loop is placed in a uniform magnetic field `0.04T` with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at `2mm//sec` . The induced emf in the loop when the radius is `2cm` isA. `1.6 pi mu v`B. `3.2 pi mu v`C. `4.8 pi mu v`D. `0.8 pi mu v` |
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Answer» Correct Answer - B `e=( d phi)/(dt)=(d)/(dt)(B pir^(2))` `=2 pi B(dr)/(dt)` `= 2 xx pi xx 2 xx 10^(-2) xx 4 xx 10^(-2) xx 2xx 10^(-3)` `=3.2 xx 10^(-6) pi Vol=3.2pi muV ` |
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