When primary coil P is moved towards secondary coil S (as shown in the Fig.) the galvanometer shows momentary deflection. State the related law.

When primary coil P is moved towards secondary coil S (as shown in the Fig.) the galvanometer shows momentary deflection. What can be done to have larger deflection in the galvanometer with the same battery?

In the circuit shown, when galvanometer G shows no deflection, the current in the 2 ohm resistor is

State the principle of moving coil galvanometer?

State the principle of moving coil galvanometer?

Show diagramatically two different arrangements used for winding the primary and secondary coils in a transformer. Assuming the transformer to be an ideal one write expressions fo rthe ratio of its output current to input current in terms of the number of turns in the primary and secondary coils. Mention two reasons for energy losses in an actual transformer.

Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards as shown in Fig. 9.36. A current in the coilproduces a deflection of 3.5^ of the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m away?:

Two tangent galvanometers have circular coils of same radii differing only in the number of turns. They are connected in series. WHen a a steady current is passed in the circuit, the mean deflections of galvanometer are theta_1 and theta_2 . deduce an expression for the ratio of number of turns of the galvanometer.

A small retangular coil ABCD contains 140 turns of wire. The sides AB and BC of the coil are of length 4.5 and 2.8 cm respectively, as shown in the figure The coil is held between the poles of a large magnet so that the coil can rotate about an axis thorugh its centre. The magnet produces a uniform magnetic field of flux density B between its poles. When the current in the coil is 170 mA, the maximum torque produced in the coil is 2.1 xx 10^-3 N m . The current in the coil in (a) is switched off and the coil s positioned as shown in the figure. The coil is then turned thorugh an angle of 90^@ in a time of 0.14 s. Calculate the average e.m.f. induced in the coil.