In a suspended type moving coil galvanometer the coil has 60 turns, each of area `2 xx 10^(-4)m^(2)` and the strength of the magnetic field is 0.001 T. A current of 20 mA produced a deflection of 10 cm on a scale at a distance of 1m form the instrument. Calcualte the torque per unit twist.

A moving coild galvanometer with a lamp-and-scale arrangement has a coil of 50 turns of mean area 1.5 cm^(2) per turn and the effective strength of the field (radial) is 0.02T. If a current of 10^(-9) A produces a deflection of 1 cm on a scale placed at 1 m away, calcualte the steady torque required to hold the suspension twisted through 1 radian.

In a moving coil galvanometer, the magnetic field used is 5T. The coil has 100 turns, each of mean area 10 xx 10^(-4) m^(2). If a current of 10^(-7) A produces a deflection of 1 mm on a scale 1m away, calcualte the current reduction factor of the galvanometer and the torsional rigidity of the suspension wire.

A rectangular coil of 50 turns, each of area 0.1 m^(2) and carrying a current of 1 A is held perpendicular to a magnetic field of 0.1 T. What is the torque acting on the coil?

A moving coil galvanometer has 28 turns and area of coil is 4 xx 10^(-2) m^(2) .If the magnetic field is 0.2 T, then to increase the current sensitivity by 25% without changing area and field, the number of turns should be changed to

A moving coil galvanometer has 100 turns and each turn has an area 2.0 cm^2 . The magnetic field produced by the magnet is 0.01 T . The deflection in the coil is 0.05 radian when a current of 10 mA is passed through it. Find the torsional constant of the suspension wire.

The coil of a moving coil galvanometer has 1000 turns each of area 3 xx 10^(-4)m^(2) . Its suspension fibre has restoring torque of 2 xx 10^(-4)N-m per degree and the radial magnetic field of induction 0.08 Wb/m. If a current of 10 µA is passed through it, then the deflection produced is

A Rectangular coil of 10 turns, each of area 0.05 m^(2) , is suspended freely in a uniform magnetic field of induction 0.01 T. A current of 30 µA is passed through it. (i) What is the magnetic moment of the coil (ii) What is the maximum torque experienced by the coil?

The coil of a moving coil galvanometer has an effective area of 4xx10^(-2)m^(2) . It is suspended in a magnetic field of 5xx10^(-2) Wb m^(-2) . If deflection in the galvanometer coil is 0.2 rad when a current of 5 mA is passed through it, then