A wheel with 4 spokes is placed with its plane perpendicular to a uniform magnetic
Channel: Doubtnut
Date: 2020-07-26

A wheel with 4 spokes is placed with its plane perpendicular to a uniform magnetic field B of magnitude 0.5 T. The field is directed into the plane of the paper and is present over the entire region of the wheel as shown in Fig. When the switch S is closed, there is initial current of 6 A between the axis and the rim and the wheel begins to rotate. Resistances of the spokes are 1, 2, 4 and 8 `Omega`, respectively. Resistance of rim is negligible. a. What is the direction of rotation of the wheel?  b. Radius of the wheel is 0.2 m. Calculate initial torque acting on the wheel.