Write the working of a moving coil galvenometer.

Explain why earth's magnetic field does not affect the working of a moving coil galvano meter.

State two factors on which the sensitivity of a moving coil galvanometer depends.

What is the basci principle of a moving coil galvanometer? Derive an expression for current flowing through the galvanometer in terms of steady angular deflection of its coil. Define voltage. Sensitivity of the galvanometer. What is a convenient way to increase its sensitivity?

Write the working of a compound microscope with a ray diagram for the formulation of image.

Write the working principle of a telescope.

Convert a moving coil galvanometer into a voltmeter.

Write the working principle of cyclotron.