Find the e.m.f. induced in a coil of 20 turns and cross-sectional area `0.2 m^2`, when a magnetic field perpendicular to the plane of the coil changes form `0.1 Wb m^-2` to `0.5 Wbm^-2` at a uniform rate over a period of 0.05 s.

Find the e.m.f. induced in a coil of 100 turns and crosssectional area 0.4 m^2 , when a magnetic field perpendicular to a plane of the coil changes from 0.5 Wbm^(-2) to 0.1Wbm(-2) at a uniform rate over a period of 0.04 s. If the resistance of the coil is 3.2kOmega , find the value of current flowing through it.

Find the magnitude of e.m.f. induced in a 200 turn coil with cross-sectional area of 0.16 m^2 , if the magnetic field through the coil changes from 0.10 Wbm^-2 to 0.30 Wb m^-2 at a uniform rate over a period of 0.05 s.

A circular coil of 50 turns and radius 0.2 cm carries a current of 12 A. Find magnetic field at the centre of the coil.

A rectangular coil having 200 turns and size 0.30 xx 0.05 m^2 is placed perpendicular to a magnetic field. The field changes from 5x10^(-3) Wbm^(-2) to 2x10(-3) Wbm(-2) in the time interval of 3 millisecond. Calculate the e.m.f. induced in the coil. If the resistance of the coil is 15Omega , find the value of current flowing through it.

State the factors on which induced e.m.f. in a coil rotating in a uniform magnetic field depends.

An e.m.f. of 250 muV is induced in a coil, when current in it changes from 10 A to 6 A in 0.4 s. What is the self inductance of the coil?