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Question Description

Electromagnetism

Phenomenon of induction of induced current in one coil due to change of current in a neighboring coil is called

Production of induced current in one coil due to production of current in neighboring coil is

When the current changes from +2 A to -2A in 0.05 s, an emf of 8V is induced in a coil. The coefficient of self-induction of the coil is

A coil is rotated in a uniform magnetic field about an axis perpendicular to the field. The emf induced in the coil would be maximum when the plane of coil is

A transformer is designed to convert voltage from 240 V a.c mains to 12 V, and has 4000 turns on its primary coil. If it is 100% efficient, and current in secondary coil was 0.4 A then current in prim

If a current of 3 A flowing in the primary coil is reduced to zero in 0.01 s then the induced emf in the secondary coil is 1500 V, the mutual inductance between the two coils is

If an e. m. f. of 300 micro volts is induced in a coil when current in it changes from 13 amperes to 7 amperes in 0.5 sec, then the value of the self inductance of the coil will be

A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by

In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will

An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be