Free Printable Review Faraday's and lenz law

1.

What would happen if I move a bar magnet in and out of a coil of copper wire?

a)

Electric current would disappear

b)

The magnet would explode

c)

Electric current will flow through the wire

d)

It would produce a gravitational field

2.

What is the direction of the induced magnetic field?

a)

Left

b)

Right

c)

Up

d)

Down

3.

Magnetic flux is related to magnetic field strength by the formula

a)

Φ=BA

b)

Φ=BA²

c)

Φ=B/A

d)

Φ=B/A²

4.

What factors affect the strength of induced emf in a closed current?

a)

Surface area

b)

Pole of magnet

c)

Magnetic field strength

d)

Number of Flux over time

e)

Number of coils

5.

A student moves a magnet into a coil of wire as shown in the diagram. The coil of wire is connected to a sensitive ammeter.

a)

increasing the number of turns on the coil

b)

increasing the speed of the magnet

c)

increasing the strength of the magnet

d)

all of the above

6.

According to Lenz’s law the direction of an induced current in a conductor will be that which tends to produce which of the following effects?

a)

enhance the effect which produces it

b)

produce a greater heating effect

c)

produce the greatest voltage

d)

oppose the effect which produces it

7.

In what direction is the magnet moving?

a)

Left

b)

Right

c)

Up

d)

Down

8.

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

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.

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

11.

What is the Pole at X

a)

North

b)

South

12.

As the north pole of the magnet is moved into the coil, the magnetic flux is _________.

a)

increasing

b)

decreasing

c)

remains constant

d)

depends on the speed of the magnet

13.

The voltmeter is at 0 in this image. How would you manipulate the experiment to create electricity (measured in volts)?

a)

Flip the magnet around so the North pole is facing out

b)

Move the magnet back and forth

c)

Take the magnet out

d)

Add more coils around the paper cylinder

14.

___ Law says that a current produced by an induced emf moves in a direction so that its magnetic field opposes the original change in flux

a)

Lenz'

b)

Faraday's

c)

Ampere's

15.

___ Law says that the Induced current is proportional to the change of magnetic flux

a)

Lenz'

b)

Faraday's

c)

Ampere's

Review Faraday's and lenz law

Total questions: 15

Worksheet time: 13mins

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