Q20: A piece of insulated wire is shaped into a figure eight as shown in Figure P31.20. For simplicity, model the two halves of the figure eight as circles. The radius of the upper circle is cm and that of the lower cir- cle is cm. The wire has a uniform resistance per unit length of V/m. A uniform magnetic field is applied perpendicular to the plane of the two circles, in the direction shown. The magnetic field is increas- ing at a constant rate of T/s. Find
(a) the magni- tude and
(b) the direction of the induced current in the wire.
pi =
g =