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A wire is bent in form of square of side a in a time varying magnetic field \( B=\alpha B_{0} \) t . If resistance per
\( \mathrm{P} \) unit length is \( \lambda \) then current in the loop will be:

W.
(1) \( \frac{a \alpha^{2} \mathrm{~B}_{0}}{\lambda} \)
(2) \( \frac{a \alpha \mathrm{B}_{0}}{4 \lambda} \)
(3) \( \frac{\alpha^{2} \mathrm{~B}_{0}}{4 a} \)
(4) \( \frac{a^{2} \alpha}{4 \mathrm{~B}_{0}} \)
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