12th Class Physics MCQS Chapter 4

If force in the direction of velocity of conductor,  then induced current is directed,

Anti clockwise

None of above

At equilibrium

Clock wise

The emf induced by the motion of a conductor across a magnetic field is called:

Motional emf

All of above

Induced emf

Rotational emf

The induced emf in a coil is proportional to:

Product of magnetic flux flux and area of the coil

Rate of change of Magnetic flux through the coil

Magnetic flux through the coil

Area of the coil

One henry is equal to

1 ohm x 1 hertz

1 ohm x 1 metre

1 ohm x 1 sec

All of above

The Direction of induced current is always so as to oppose the change which causes the current, is:

Faraday’s law

Ohm’s law

Lenz’s law

Kirchhoff’ s1ast rule

Electromagnetic induction is exactly according to law of:

Mass

Charge

Energy

Momentum

The Si unit of Mutual inductance is:

ASV^-1

VSA^-1

VA^-1S^-1

VAS^-1

In self induction A coil is connected in__________ with battery and a rheostat.

Both A and B

Series

Parallel

None of above

Commutator was invented in

1835

1834

1840

1820

For inducing emf in a coil the basic requirement is that:

Both (b) and (c) are true

Coil should form a closed loop

Flux should link the coil

Change in flux should link the coil