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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/s. The induced emf in the loop when the radius is 2cm is

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$3.2 π μ N$

$4.8 π μ N$

$0.8 π μ N$

$1.6 π μ N$

answer is A.

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Detailed Solution

$ρ = - \frac{d ϕ}{d t}$

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