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A rectangular loop PQRS made from a uniform wire has length a and breadth b and mass \( \mathrm{m} \). It is free to rotate about the arm PQ, which is hinged about the horizontal axis ( \( y \)-axis). A uniform magnetic field
\( B_{0} \hat{i} \) exists in the region. If the loop remains in horizontal position in equilibrium, then the magnitude of current in loop is \( (P Q=S R=b, S P \)
(1) \( \frac{\mathrm{mg}}{3 \mathrm{~B}_{0} \mathrm{a}} \)
(2) \( \frac{m g}{6 B_{0} a} \)
(3) \( \frac{m g}{2 B_{0} b} \)
(4) \( \frac{m g}{6 B_{0} b} \)
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