Questions in Moving Charges and Magnetism

Select	Question
	Four wires each of length 2.0 metres are bent into four loops P, Q, R and S and then suspended into uniform magnetic field. Same current is passed in each loop. Which statement is correct
	A current carrying rectangular coil is placed in a uniform magnetic field. In which orientation, the coil will not tend to rotate
	A current carrying circular loop is freely suspended by a long thread. The plane of the loop will point in the direction
	A current carrying loop is free to turn in a uniform magnetic field. The loop will then come into equilibrium when its plane is inclined at
	The expression for the torque acting on a coil having area of cross-section A, number of turns n, placed in a magnetic field of strength B, making an angle $\theta $ with the normal to the plane of the coil, when a current i is flowing in it, will be
	The pole pieces of the magnet used in a pivoted coil galvanometer are
	The sensitiveness of a moving coil galvanometer can be increased by decreasing
	A metallic loop is placed in a magnetic field. If a current is passed through it, then
	Two parallel conductors A and B of equal lengths carry currents I and 10 I, respectively, in the same direction. Then
	Three long, straight and parallel wires carrying currents are arranged as shown in figure. The force experienced by 10 cm length of wire Q is