Free Printable Electromagnetic Induction

1.

Electromagnetic induction is due to change in ___________________.

a)

surface area

b)

magnetic poles

c)

magnetic flux

d)

electric flux

2.

Voltage can be induced in a wire by

a)

a. moving the wire near a magnet.

b)

b. moving a magnet near the wire.

c)

c. changing the current in a nearby wire.

d)

d. all of these

3.

A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage

a)

quadruples

b)

doubles

c)

is the same

d)

halves

4.

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

a)

Lenz'

b)

Faraday's

c)

Ampere's

d)

Gauss's Law

5.

Which activity will produce the highest current?

a)

Move the magnet bar into the coil while the coil remains stationery

b)

Move the coil into the magnet bar while the magnet remains stationery

c)

Move the coil and magnet towards each other

d)

Move the coil and magnet away from each other

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.

___ 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

d)

Henry's

8.

If you wrap more coils around an electromagnet, it will become...

a)

brighter

b)

stronger

c)

weaker

d)

invisible

9.

Find the direction of the magnetic force.

a)

Into the screen

b)

Out of the screen

c)

Right

d)

Left

10.

A 4.0 m long cord is lying perpendicular to Earth's magnetic field of 5.6X10^-5 T. If the cord is carrying a current of 11.0 A, what magnetic force is acting on the cord?

a)

2.03X10^-5 N

b)

0.002464 N

c)

2.46X10⁷ N

d)

7.86X10⁵ N

11.

Passing a current through a solenoid will produce

a)

a magnetic field

b)

an electric field

c)

a current field

d)

nothing is produced

12.

The unit of magnetic flux is the

a)

Henry

b)

Tesla

c)

Faraday

d)

Weber

13.

Based on this picture, which side will have a higher voltage?

a)

Secondary

b)

Primary

c)

Both sides have the same voltage

d)

Cannot be determined

14.

Faraday's law calculates voltage.

a)

True

b)

False

15.

___________________rule can be used to determine the direction of the ___________ induced current produced.

a)

Fleming's Left Hand Rule

b)

Fleming's Right Hand Rule

c)

Right Hand Grip Rule

16.

In Fleming's Right Hand Rule, First finger and center finger represent

a)

current, magnetic field

b)

magnetic field, current

c)

force, current

d)

magnetic field, force

17.

____________law states that the direction of the induced current is such that it always _______ ___ the change producing it.

a)

Lenz's Law, oppose

b)

Faraday's Law, oppose

c)

Lez's Law, follow

d)

Faraday's Law, follow

18.

No EMF is induced when?

a)

When the wire is not moving

b)

When the wire is parallel to magnetic field direction

c)

When no lines are cut by the wire

d)

all of the above

19.

Electromagnetism is when

a)

magnetism causes electricity

b)

electricity causes magnetism

c)

electricity and magnetism cancel each other out

d)

a strong magnet creates a permanent magnet

20.

A(n) ___ converts electricity into magnetism.

a)

electric transformer

b)

electric generator

c)

electromagnet

d)

electric motor

21.

A(n) ___ converts magnetism into electricity.

a)

electric transformer

b)

electric generator

c)

electromagnet

d)

electric motor

22.

A(n) ___ converts electricity into magnetism, and back to electricity.

a)

electric transformer

b)

electric generator

c)

electromagnet

d)

electric motor

23.

The net magnetic flux through any closed surface, kept in a magnetic field is

a)

zero

b)

$\frac{\mu_o}{4\pi}$

c)

$\frac{\mu_om}{4\pi}$

d)

$\frac{\mu_o}{4\pi m}$

24.

A square of side 'a' metre lies in the YZ plane in a region, where the magnetic field is given by $B=B_o\left(3i+3j-4k\right)T$ , where $B_o$ is constant. The magnitude of flux passing through the square is

a)

$2B_oa^2\ \ Wb$

b)

$3B_oa^2\ \ Wb$

c)

$4B_oa^2\ \ Wb$

d)

$-4B_oa^2\ \ Wb$

25.

A circular loop of radius 10cm, 500 turns and resistance 2 ohm is placed with its plane perpendicular to the horizontal component of Earth's magnetic field. It is rotated about its vertical diameter through $180^o$ in 0.25s. Find the magnitude of the emf induced in the coil. Horizontal component of the Earth's magnetic field at the place is $3\times10^{-5}\ T$ .

a)

$3\times10^3\ V$

b)

$3.8\times10^3\ V$

c)

$3\times10^4\ V$

d)

$3.8\times10^{-3}\ V$

26.

A coil of resistance 400 ohm is placed in a magnetic field. If the magnetic flux linked with the coil varies with time (t) as $\phi=50t^2+4$ . Current through coil at 2s is

a)

0.1 A

b)

0.5 A

c)

5 A

d)

1.5 A

27.

Wire loop is rotated in magnetic field. The frequency of change of direction of the induced emf is

a)

once per revolution

b)

twice per revolution

c)

thrice per revolution

d)

four times per revolution

28.

A rectangular loop and a circular loop are moving out of a uniform magnetic field region. In which loop do you expect the induced emf to be constant

a)

Circular loop

b)

Rectangular loop

c)

Both (a) and (b)

d)

Neither (a) nor (b)

29.

The north pole of a bar magnet is moving towards the coil along the axis passing through the centre of coil and perpendicular to the plane of coil. The direction of induced current in the coil when viewed from the opposite direction of the motion of the magnet is

a)

Clockwise

b)

Anticlockwise

c)

No current in the coil

d)

Data insufficient

30.

A wheel with 10 metallic spokes each 0.5m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component (H) of Earth's magnetic field at a place. If H = 0.4 G at the place, what is the induced emf between the axle and the rim of the wheel>

a)

$62.8\times10^{-5}V$

b)

$0.628\times10^{-5}V$

c)

$6.28\times10^{-5}V$

d)

$628\times10^{-5}V$

Electromagnetic Induction

Total questions: 30

Worksheet time: 5hrs 0mins

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