Free Printable Faraday and Lenz

1.

1. In electromagnetic induction, the induced e.m.f. in a coil is independent of

a)

Change in the flux

b)

Time

c)

Resistance of the circuit

d)

None of the above

2.

Lenz's law is consequence of the law of conservation of

a)

Charge

b)

Momentum

c)

Mass

d)

(d) Energy

3.

The magnetic flux linked with a coil is given by an equation flux (in webers) = $8t^2+3t+5$ . The induced e.m.f. in the coil at the fourth second will be

a)

16 units

b)

39 units

c)

67 units

d)

145 units

4.

A square coil $10^{-2}\ m^2$ area is placed perpendicular to a uniform magnetic field of intensity $10^3\ \frac{wb}{m^2}$ . The magnetic flux through the coil is

a)

10 weber

b)

$10^5$ weber

c)

weber

$10^{-5}$

d)

100 weber

5.

The direction of induced e.m.f. during electromagnetic induction is given by

a)

Faraday's law

b)

Lenz's law

c)

Maxwell's law

d)

Ampere's law

6.

Which action will increase the deflection of the galvanometer pointer?

a)

The magnetic pole is reversed

b)

The number of turns of coils is increased

c)

The coil is made from insulated wire

d)

The magnet is slowly pushed into the coil

7.

A coil having 500 square loops each of side 10 cm is placed normal to a magnetic flux which increases at the rate of 1.0 tesla/second. The induced e.m.f. in volts is

a)

0.1

b)

0.5

c)

1

d)

5

8.

The total charge induced in a conducting loop when it is moved in magnetic field depends on

a)

The rate of change of magnetic flux

b)

Initial magnetic flux only

c)

The total change in magnetic flux

d)

Final magnetic flux only

9.

The north pole of a magnet is brought near a metallic ring. The direction of the induced current in the ring will be

a)

Clockwise

b)

Anticlockwise

c)

Towards north

d)

Towards south

10.

The formula for induced e.m.f. in a coil due to change in magnetic flux through the coil is (here A = area of the coil, B = magnetic field)

a)

$e=-A\ \frac{\text{d}B}{\text{d}t}$

b)

$e=-B\ \frac{\text{d}A}{\text{d}t}$

c)

$e=-\frac{\text{d}\left(B\ .\ A\right)}{\text{d}t}$

d)

$e=-\ \frac{\text{d}\left(B\ \times A\right)}{\text{d}t}$

11.

The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane along the perpendicular direction. The direction of the induced current in the conducting plane will be

a)

Horizontal

b)

Vertical

c)

Clockwise

d)

Anticlockwise

12.

An infinitely long cylinder is kept parallel to an uniform magnetic field B directed along positive z axis. The direction of induced current as seen from the z axis will be

a)

Clockwise of the +ve z axis

b)

Anticlockwise of the +ve z axis

c)

Zero

d)

Along the magnetic field

13.

If a coil of metal wire is kept stationary in a non-uniform magnetic field, then

a)

An e.m.f. is induced in the coil

b)

A current is induced in the coil

c)

Neither e.m.f. nor current is induced

d)

Both e.m.f. and current is induced

14.

A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then

a)

A current will be induced in a coil

b)

No current will be induced in a coil

c)

Only an e.m.f. will be induced in the coil

d)

An e.m.f. and a current both will be induced in the coil

15.

A magnet is brought towards a coil (i) speedly (ii) slowly then the induced e.m.f./induced charge will be respectively

a)

Faraday and Lenz

Total questions: 18

Worksheet time: 9mins

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