A transformer is used to set up an alternating e.m.f. of 220 V to 4.4 kV to transmit 6.6 kW of power. The primary coil has 1000 turns. The current rating of the secondary coil is (Transformer is ideal)

A monoatomic gas is heated at constant pressure. The percentage of total heat used for doing external work is

A parallel plate capacitor is charged and then isolated. If the separation between the plates is increased, which one of the following statement is NOT correct?

The ratio of the radius of the first Bohr orbit to that of the second Bohr orbit of the orbital electron is