A closely wound search coil consists of an area of 3.21 cm2, 120 turns and a resistance of 58.7 O. This is joined to a charge-measuring instrument whose resistance is 45.5 O. If the coil is rotated quickly from a position parallel to the uniform magnetic field to one perpendicular to the field, the instrument points out a charge of 3.53 x 10-5 C.
Determine the magnitude of the magnetic field?