Twocoils are placed closed to each other. The mutual inductance of the pair ofcoils depends upon

1.      Ifa secondary coil has 40 turns, and, a primary coil with 20 turns is chargedwith 50 V of potential difference, then potential difference in secondary coilwould be

The magneticflux linked with a coil of N turns of area of cross section A held with itsplane parallel to the field B is

Why do some electricalappliances in the home need a transformer instead of operating directly from mains power

Coil A has 20 turns and coil B of 100 turns are both moved ina uniform magnetic field so that they cut magnetic flux at the same rate. Therate of the electromotive force induced across coil A to that of coil B is