A galvanometer coil `5 cm xx 2 cm` with 200 turns is suspended vertically in a field of `5 xx 10^-2 T`. The suspension fibre needs a torque of `0.125 x10^-7 N -m` to twist it through one radian. Calculate the strength of the current required to be maintained in the coil if we require a deflection of `6^@`.

A galvanometer coil of rectangular shape of length 4 cm and width 2 cm contains 200 turns of insulated copper wire. It is suspected in a magnetic field of 0.005 T and the suspension produces a torque of 10^(-6) Nm per unit twist. What steady current passing through the coil will produce deflection of 5^(@) ?

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 circular coil of 30 turns and radius 8.0 cm carrying 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 to the coil. Calculate the magnitude of the counter torque, that must be applied to prevent the coil from turning.

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 form turning.

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 rectangular coil of M.C.G. of 100 turns of effective area 12cm^2 hangs in a magnetic field of 1.5xx10^-2 T . If the torsional constant of the suspension fibre is 1.5xx10^-8 Nm per radian then current sensitivity of M.C.G. is

A bar magnet lies in a magnetic field of intensity 0.5 xx 10^(-4) tesla. The torque required to deflect it through 30^(@) is 2.5 xx 10^(-5)N m . Calculate the magnetic moment of the magnet.