The coil of a moving-coil galvanometer keeps on oscillating for along time if it is deflected and released. If the ends of the coil are connected together, the oscillation stops at once. Explain.

Write principle of moving coil galvanometer.

Explain working of moving coil galvanometer and write its uses.

The resistance of a moving coil galvanometer is 20Omega . It requires 0.01A current for full scale deflection calculate the value of resistan ce required to convert it into a voltmeter of range 20 volt.

The deflection in Moving coil Galvanometer falls from 50 divisions to 10 divisions, when a shunt of 12 Omega is connected with it. The resistance of Galvanometer coil is

Figure shows a metal rod PQ resting on the smooth rails AB and positioned between the poles of a permanent magnet. The rails, the rod, and the magnetic field are in three mutual perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod =15 cm, B =0.50 T, resistance of the closed loop containing the rod 9.0 m Omega . Assume the field to be uniform. (a) Suppose K is open and the rod is moved with a speed of 12 "cm s"^(-1) in the direction shown. Give the polarity and magnitude of the induced emf. (b) Is there an excess charge built up at the ends of the rods when K is open ? What if K is closed ? (c) With K open and the rod moving uniformly, there is no net force on the electrons in the rod PQ even though they do experience magnetic force due to the motion of the rod. Explain. (d) What is the retarding force on the rod when K is closed ? How much power is required (by an external agent) to keep the rod moving at the same speed (= 12 cm s^(-1) ) when K is closed ? How much power is required when K is open? (f)How much power is dissipated as heat in the closed circuit ? What is the source of this power ? (g) What is the induced emf in the moving rod if the magnetic field is parallel to the rails instead of being perpendicular ?

Explain construction and principle of moving coil galvanometer.

In order to increase the sensitivity of a moving coil galvanometer, ______ should be decreased.

Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is

What is reason behind no damage in wire of coil of galvanometer after connecting shunt.

A magnet is moving towards a coil along its axis and the emf induced in the coil is epsilon . If the coil also starts moving towards the magnet with the same speed, the induced emf will be ____