If we double the distance between two charges, then force becomes

Sound waves having frequency lower than 20 Hz are called:

At room temperature, electrons cannot escape the metal surface due to ………….. of atomic nucleus:

Which instrument measures the potential difference:

Half of radius of curvature is called:

When you rub a plastic rod against your hair several times and put it near some bits of paper, the pieces of papers are attracted towards it. What does this observation indicate:

The line which passes through pole of the mirror and center of curvature is called principal:

A positive electric charge:

George Boole invented:

Study of charges at rest is called __________

If the needle of galvanometer shows some deflectlon, it would indicate the

A resistance which is connected with the galvanometer in order to convert it into ammeter should have