Electromagnetic...

When a current of 5 A flows in the primary coil then the flux linked with the secondary coil is 200 weber. The value of coefficient of mutual induction will be

A straight copper wire is moved in a uniform magnetic field such that it cuts the magnetic lines of force. Then

The coefficient of mutual induction between two coils is $$1.25 H.$$ If the rate of fall of current in the primary is $$80$$ As$$^{-1}$$, then the induced emf in the secondary coil will be

The rate of change of magnetic flux density through a circular coil of area 10 m and number of turns 100 is 10$$^3$$ Wb/m$$^2$$/s. The value of induced emf will be

A coil of area 80 cm$$^2$$ and number of turns 50 is rotating about an axis perpendicular to a magnetic field of 0.05 Tesla at 2000 rotations per minute. The maximum value of emf induced in it will be

If the turns ratio of a transformer is 2 and the impedance of primary coil is 250 W then the impedance of secondary coil will be

The coefficient of self induction of a coil is given by

Two circular conducting loops of radii $$R_1$$ and $$R_2$$ are laying concentrically in the same plane. If $$R_1$$ > $$R_2$$ then the mutual inductance (M) between them will be proportional to :

The length of side of a square coil is 50 cm and number of turns in it is 100. If it is placed at right angles to a magnetic field which is changing at the rate of 4 Tesla/s, then induced emf in the coil will be :

If a spark is produced on removing the load from an AC circuit then the element connected in the circuit is