A current of 10A passes through a coil having 5 turns and produces a magnetic field of magnitude. `5 xx 10^-4T` at th e centre of the coil. Calculate the diameter of the coil.

A 50 m long solenoid has 500 turns and produces a magnetic field of 2.5 xx 10^-4 T at its centre. Find the current in the solenoid.

A circular coil of 30 turns and radius 8.0 cm carrying a current of 6.0 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 60^@ with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning.

(a) A circular coil of 30 turns and radius 8.0 cm carrying a current of 6.0 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 60 ^@ with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning. (b) Would your answer change, if the circular coil in were replaced by a planar coil of some irregular shape that encloses the same area? (All other particulars are also unaltered.)

A current of 0.1 A circulates around a coil of 100 turns and having a radius equal to 5 cm . The magnetic field set up at the centre of the coil is ( mu_(0)=4pixx10^(-7) weber/amper-metre)

A long wire carries a steady current . It is bent into a circle of one turn and the 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

Through a coil of radius 3 cm and 25 turns, a current is passed so as to produce a magnetic induction of 10pi xx 10^-5 wb//m^2 , at a point distant 4 m from the centre of the coil on its axis. Find the current.

The electric current in a circular coil of two turns produced a magnetic induction of 0.2 T at its centre. The coil is unwound and then rewound into a circular coil of four turns. If same current flows in the coil, the magnetic induction at the centre of the coil now is

The number of turns in a circular coil of wire is 10 and average radius of each turn is 8 cm. A current of 5A is passed through the coil. Find the magnetic induction due to the current at a point at a distance of 6 cm on the axis of the coil from the centre.

A rectangular coil of 100 turns of length 40 cm and breadth 20 cm carrying a current of 10 A is placed making a angle of 60^@ with a magnetic field of 5T:- Calculate the magnitude of the counter torque, that must be applied to prevent the coil from turning.