Calculation of induced emf

Calculate the induced emf in a coil of 10 H inductance in which the current changes from 8A to 3A in 0.2 s.

A copper disc of radius 10 cm rotates 20 times per scond with its axis parallel to a uniform magnetic field of 0.5 tesla . Calculate the induced emf between the centre and the edge of the disc.

Shows a copper rod moving with velocity v parallel to a long straight wire carrying current = 100 A . Calculate the induced emf in the rod, where v = 5 m S^(-1) , a = 1 cm , b = 100cm .

A conducting wire of length 10 cm is moving perpendicular in a region of magnetic field 1 tesla with a speed of 10 m s^(-1) . Calculate the induced emf in the conductor.

State Lenz's law of electromagnetic induction. The magnetic threading of'a coil changes from 12 xx 10^(-3) Wb to 6 xx 10^(-3) Wb in 0.01 second. Calculate the induced emf.

The coefficient of mutual induction between the primary and secondary of a transformer is 5 H. Calculate the induced emf in the secondary when 3 ampere current in the primary is cut off in 2.5 xx 10^(-4) second.

The magnetic flux threading a coil changes from 12xx10^(-3)" Wb to " 6xx10^(-3) Wb in 0.1 s . Calculate the induced emf.

A square loop of side 20 cm is placed on a plane and magnetic field intensity of 0.1 T is applied at an angle 30^(@) with the plane of the loop. Magnetic field is changed to zero uniformly within 0.8 second. Calculate the induced emf and current in the loop.