Why the coil of a dead beat galvanometer is would on a metal frame?

Why the coil of a dead beat galvanometer is wound on a metal frame?

The number of turns and radius of cross-section of the coil of a tangent galvanometer are doubled. The reduction factor K will be

The plane of the coil of tangent galvanometer is kept parallel to magnetic meridian to

Before using tangent galvanometer for the measurement of current, why is the plane of coil of tangent galvanometer set in the magnetic meridian?

In a moving coil galvanometer is based on the

A galvanometer has coil of resistance 50Omega and shows full deflection at 100muA . The resistance to be added for the galvanometer to work as an ammeter of range 10mA is nearly

A moving coil galvanometer has 50 turns and each turn has an area 210 . The magnetic field produced by the magnet inside the galvanometer is 0.02 . The torsional constant of the suspension wire is 10 . When a current flows through the galvanometer, a full scale deflection occurs if the coil rotates by 0.2 . The resistance of the coil of the galvanometer is 50 . This galvanometer is to be converted into an ammeter capable of measuring current in the range 01.0 . For this purpose, a shunt resistance is to be added in parallel to the galvanometer. The value of this shunt resistance, in , is __________.

A coil of insulated copper wire is connected to galvanometer. What would happen if a bar magnet is (i) pushed into the coil? (ii) withdrawn from inside the coil? (iii) held stationary inside the coil?

A coil of insulated copper wire is connected to galvanometer. What would happen if a bar magnet is (i) pushed into the coil? (ii) withdrawn from inside the coil? (iii) held stationary inside the coil?

(A) : Working of a moving coil galvanometer is based on heating effect of current. (R) : On heating, the coil starts to rotate in moving coil galvanometer because fo torque.