If the angular speed of the armature of a dynamo is doubled then the amplitude of the induced e.m.f will become_______.

If rotational velocity of a dynamo armature is doubled, then induced e.m.f. will become

When DC motor run at full speed , then induced emf will be

Name two factors on which the magnitude of an induced e.m.f. in the secondary coil depends.

A spring mass system preforms S.H.M if the mass is doubled keeping amplitude same, then the total energy of S.H.M will become :

The average speed of gas molecules is v at pressure P, If by keeping temperature constant the pressure of gas is doubled, then average speed will become

A square frame ABCD of side a and a long current carrying conductor PQ are arranged as shown in the figure. If the frame moves towards right with a velocity v, the resultant induced e.m.f in the loop will be

The mutual inductance between two coils is 1.25 henry. If the current in the primary changes at the rate of 80 ampere//second , then the induced e.m.f. in the secondary is

Two identical loops , one of copper and the other of aluminium , are rotated with the same angular speed in the magnetic field . Compare (i) the induced emf and (ii) the current produced in the two coils . Justify your answer .

A rectangular coil of 300 turns has an average area of average area of 25 cmxx10 cm the cooil rotates with a speed of 50 cps in a uniform magnetic field of strength 4xx10^(-2)T about an axis perpendicular of the field. The peak value of the induced e.m.f. is (in volt)

A flat coil of 500 turns each of area 50 cm^(2) rotates in a uniform magnetic field of 0.14 Wb//m^(2) at an angular speed of 150 rad//sec . The coil has a resistance of 5 Omega . The induced e.m.f. is applied to an external resistance of 10 ohm. Calculate the peak current through the resistance.