A1.2-kg rod that has a length of 1.0 m and a resistance of 5.0 o slides with constant speed down a pair of frictionless vertical conducting rails that are joined at the bottom. other than the rod, the rest of the circuit is resistanceless. a uniform magnetic field of magnitude 3.0 t is perpendicular to the plane formed by the rod and the rails as shown. determine the speed of the rod.
a)0.38 m/s
b)0.90 m/s
c)2.6 m/s
d)6.5 m/s
e) 8.7 m/s