A metal rod of mass `m` can rotate about a horizontal axis `O`, sliding along a circular conductor of radius `a` (fig). The arrangment is located in a unifrom magnetic field of induction `B` directed perpendicular to the ring plane. The axis and the ring are connected to an emf source to form a circuit of resistance `R`. Neglecting the friction, circuit induction and ring resistance, find the law according to which the source and must very to make the rod rotate with a constant angular velocity `omega`.

A rod of mass m can rotate without friction about axis sliding (also without friction) along a conducting ring of radius b arranged in a vertical plane as shown in the . The entire arrengement is placed in a uniform magnetic field with the inducetion B perpendicular to the plane of the ring. The axis and the conductor are connected to teh terminals of a current source. Determine (a) according to which law current I flowing in the rod must vary for the rod to rotate at a constant angular speed. Being to measure the time from the instant when the rod is in its right-hand horizontal position. Consider the current to be positive when it flows from the axis of rotation toward the ring. (b) what emf E of the source must be applied to maintain the required current? Consider the total resistance of the circuit to be constant and equal to R . Disergard the inductance of teh circuit.

A circular conducting ring of radius 'a' is rolling with slipping on a horizontal surface as shown. A uniform magnetic field B is existing perpendicular to the plane of motion of the ring. The emf iniduced between the points A and D of the ring is

A circular conducting ring of radius 'a' is rolling with slipping on a horizontal surface as shown. A uniform magnetic field B is existing perpendicular to the plane of motion of the ring. The emf iniduced between the points A and D of the ring is

A metal ring of radius r =0.5m with its plane noraml a unifrom magnetic field B of induction 0.2T carries a current I=100A The tension in newtons develoed in the ring is

A metal ring of radius r =0.5m with its plane normal a unifrom magnetic field B of induction 0.2T carries a current I=100A The tension in newtons developed in the ring is

As shown in fig. a conducting ring R is placed on the axis of a bar magnet M. The plane of R is perpendicular to the axis M can move along this axis _____

A horizontal ring of radius r spins about its axis with an angular velocity omega in a uniform vertical magnetic field of magnitude B . The emf induced in the ring is