A conducting circular loop is placed in a uniform magnetic field 0.04 ~T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 ~mm / s . The induced emf in the loop when the redius is 2 ~cm is :

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Correct answer: B. 3.2 v

aligned e & = d dt = d dt ( B r ^2 ) & =2 rB dr dt & =2 2 10⁻² 4 10⁻² 2 10⁻³ & =3.2 10⁻⁶ Vol =3.2 V aligned

A conducting circular loop is placed in a uniform magnetic field 0.04 ~T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 ~mm / s . The induced emf in the loop when the redius is 2 ~cm is :

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