A soap bubble is charged to a potential of 16 V its radius is then doubled . the potential bubble now will be

With the rise of temperature the resistivity of a semiconductor

Resistance of ideal voltmeter is

Word done by frictional force is

If the 'forward voltage ' in a diode is increased , then the width of depletion region

Rainbow is formed due to combinations of

An antenna of light 500m , what will be its range ?(radius of earth = 6400 km)

If contact between football and leg lasts for 1/50 second , then the force acted on the ball

A current carrying small loop behaves like a small magnet . If 'A' be its area and 'M' its magnetic moment , the current in the loop will be

Cyclotron frequency of an electron grating in a magnetic field of 1 T is approximately