If electron is moving from A to B in wire AB, then current induced in the coil is

• anticlockwise

• clockwise

• arbitrary direction

• no current will be induced

A 100 mH coil carries a current of 1 A. The energy stored in the magnetic field is

• 0.1 J

• 0.05 J

• 0.5 J

• 1 J

The mutual inductance of an induction coil is 5 H. In the primary coil, the current reduces from 5 A to zero is ${10}^{-3}$s What is the induced emf in the secondary coil?

• 2500 V

• 25000 V

• 2510 V

• Zero

Two coils of self-inductance L₁ and L₂ are placed so close together that effective flux in one coil is completely linked with the other. If M is the mutual inductance between them, then

• M = L₁L₂

• M = L_1/L₂

• M = L

• $\mathrm{M} = \sqrt{{\mathrm{L}}_1{\mathrm{L}}_2}$

S.I unit of magnetic flux is :

• tesla

• oersted

• weber

• gauss

If a current of 3 A fl.owing in the primary coil is reduced to zero in 0.01 s then the induced emf in the secondary coil is 1500 V, the mutual inductance between the two coils is :

• 0.5 H

• 5 H

• 1.5 H

• 10 H

Two similar coils are kept mutually perpendicular such that their centres coincide. At the centre, find the ratio of the magnetic field due to one coil and the resultant magnetic field through both coils, if the same current is flown :

• 1 : $\sqrt{2}$

• 1 : 2

• 2 : 1

• $\sqrt{3}$ : 1

Lenz's law is based on the principle of conservation of

• mass

• charge

• momentum

• energy

A conducting square loop of side L and resistance R moves in its plane with a uniform velocity v, perpendicular to one of its sides. A magnetic field of induction B, constant in space and time and pointing perpendicularly into the plane of the square, exists  everywhere in space. The current induced in the loop is

• BLv/R in the clockwise direction

• BLv/R in the anticlockwise direction

• 2 BLv/R in the clockwise direction

• zero

Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon

• the rates at which currents are changing in the two coils

• relative position and orientation of the two coils

• the materials of the wires of the coils

• the currents in the two coils