Set 16 Problem 7 Expanding Loop in a Magnetic Field The radius of an elastic circular loop increases at a constant rate, dr/di = 6.6 cm/s. The loop is in a region of constant magnetic field B = 0.46 T whose direction is perpendicular to the plane of the loop. At : = 0, the radius of the loop is 2.3 cm. Determine the emf induced in the loop at t = 0, JL J. emf = 43.85x104 V OK abc 1X10 0.004385 V Submit Reset Reset All .First figure out an expression for the area A(t) of the loop as a function of time t. Then use Faraday's law: emf = d/dr(BA). and at t = 1.21 s. O. emf = V abc sin(x 0x10' Submit Reset Reset All