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

Write the working of a moving coil galvenometer.

Write about earth's magnetic field.

Write the value of earth's magnetic field.

Why magnetic field exist inside a magnet?

What are limits of earth's magnetic field?

Does a magnetic field exert a force on a static charge?

A metal rod of length L meter rotates about one end in a vertical plane at right angles to the magnetic-meridian. Frequency of revolution is f Hz.If the horizontal component of Earth's magnetic field is H Tesla then find the expression of inducted emf between the ends of the rod.

Explain why an unmagnetised piece of iron is attracted by a bar magnet.

"The strength of the earth's magnetic field varies from place to place". Explain.