Fig. Shows a conducting circular loop of radius a placed in a uniform, perpendicular magnetic field B. A thick metal rod OA is pivoted at the centre O. The other end of the rod touches the loop at A. The centre O and a fixed point C on the loop are connected by a wire OC of resistance R. A force is applied at the middle point of the rod OA perpendicularly, so that the rod rotates clockwise at a uniform angular velocity `(omega)`. Find the force.

Figure shows a conducting circular loop of radius a placed in a uniform, perpendicular magnetic field B.A thick metal rod OA is pivoted at the centre O . The other end of the rod toucher the loop are connected by a wire OC of resistance R.A force is applied at the middle point of the rod OA perpendicularly, so that the rod rotates clockwise at a uniform angular velocity omega . Find the force. (b) Consider the situation shown in the figure of the previous problem. Suppose the wire connecting O and C has zero resistance but the circular loop has a resistance R uniformly distributed along its lenght. The rod OA is made to rotate with a uniform angular speed omega as shown in the figure. Find the current in the rod when angleAOC=90^(@) .

Shows a conducting circular loop radius a placed in a uniform, perpendicular magnetic field B. A metal rod OA is pivoted at the centre O of the loop. The other A of the rod touches the loop. The rod OA and the loop are resistanceless but a resistor having a resistance R is connected between O and a fixed point C on the loop . the rod OA is made to rotate anticlockwise at a small but uniform angular speed omega by an external force. Find (a) the current in the resistance R and (b) the torque of the external force needed ot keep the rod rotating with the constant angular velocity omega.

Shows a conducting circular loop radius a placed in a uniform, perpendicular magnetic field B. A metal rod OA is pivoted at the centre O of the loop. The other A of the rod touches the loop. The rod OA and the loop are resistanceless but a resistor having a resistance R is connected between O and a fixed point C on the loop . the rod OA is made to rotate anticlockwise at a small but uniform angular speed omega by an external force. Find (a) the current in the resistance R and (b) the torque of the external force needed ot keep the rod rotating with the constant angular velocity omega.

A circular loop of radius R carrying a current is placed in a uniform magnetic field with its plane perpendicular to B. The force on the loop is

A conducting circular loop of radius r carries a constant i. It is placed in a uniform magnetic field B such that B is perpendiclar to the plane of thre loop is .What is the magnetic force acting on the loop?

A conducting circular loop of radius r carries a constant current I. It is placed in a uniform magnetic field vec(B) such that vec(B) is perpendicular to the plane of the loop. The magnetic force acting on the loop is