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A conducting circular loop is placed in a uniform magnetic field, \( B=0.025 \mathrm{~T} \) with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of \( 1 \mathrm{~mm} \mathrm{~s}^{-1} \). The induced emf when the radius is \( 2 \mathrm{~cm} \), is
(a) \( 2 \pi \mu \mathrm{V} \)
(b) \( \pi \mu \mathrm{V} \)
(c) \( \frac{\pi}{2} \mu \mathrm{V} \)
(d) \( 2 \mu \mathrm{V} \)
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