11. A circular copper loop of radius R = 10 cm carries a current of I = 15 amp. At its center is placed a second loop of radius r = 1.0 cm, having n = 50 turns and a current of i = 1.0 amp. (a) What magnetic field B does the large loop set up at its center? (b) What torque acts on the small loop? Assume that the planes of the two loops are at right angles and that, to good approximation, the magnetic field B provided by the large loop is uniform throughout the volume occupied by the small loop.