12 11. a metallic wire of uniform cross-section and resistance r is bent into a circle of radius a. the circular loop is placed in a magnetic field b(t) which i

12 11. A metallic wire of uniform cross-section and resistance R is bent into a circle of radius a. The circular loop is placed in a magnetic field B(t) which is perpendicular to the plane of the wire. This magnetic field is uniform over space, but its magnitude decreases with time at a constant rate k, where d B( k = dt The tension in the metallic wire is (a) Ta"k la)2RB()| (b) BO (d) zero

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