A brass wire coil is pulled in a magnetic field with a definite velocity. If the Ohmic resistance of the coil increased, will it be easier to pull it? If the magnetic field be doubted then how much force will be applied?

The magnetic field at the centre of the current carrying coil :

A circular coil of radius R carries a current I . The magnetic field at its centre is B . At what distance from the centre, on the axis of the coil the magnetic field will be B/8 ?

A long wire carries a steady current, it is bent into a circle of 1 turn and magnetic field at the centre of the coil is B. It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil will be

The induced emf in a coil rotating in a magnetic field is maximum when the angle between the plane of the coil and the direction of field is :

A current carrying loop of radius r carries a current I . It is placed in a magnetic field B_0 such that the plane of the coil is perpendicular to the magnetic field. The net force on the coil is

How are the magnitudes of the electric and magnetic fields related to the velocity of the EM wave?

A circular coil of 20 turns and radius 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in the coil is 5.0 A, what is the (a) total torque on the coil, (b) total force on the coil, (c) average force on each electron in the coil due to the magnetic field? (The coil is made of copper wire of cross-sectional area 10^(-5) m^2 , and the free electron density in copper is given to be about 10^29 m^(-3) .)