Moving Charges ...

A straight horizontal conducting rod of length 0.5 m and mass 50 g is suspended by two vertical wires at its ends. A current of 5.0 A is set up in the rod through the wires. What magnetic field should be set up normal to the conductor such that the tension in the wires is zero? (lgnore the mass of the wires and take g = 10 ms^-2.)

In the region around a moving charge, there is

A circular coil of radius r, having n number of turns and carrying a current I, produces magnetic field of magnitude B at its centre. B can be doubled by

A particle of charge q and mass m moves in a circular orbit of radius r with an angular speed ω. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on

Two particles, each of mass m and charge q, are attached to the two ends of a light rigid rod of length 2I. The rod is rotated at a constant angular speed about a perpendicular axis that passes through its centre. The ratio of the magnitude of the magnetic moment of the system to its angular momentum about the centre of the rod is