Free Printable Magnetism

1.

What are the lines for a magnetic field called?

a)

Magnetic Flux lines

b)

Magnetic lines

c)

Field lines

d)

Magnetic field lines

2.

If the flux lines are closer the flux density is?

a)

Lower

b)

Higher

c)

Weaker

d)

Inducted

3.

True or False, If the flux density is high the weaker the magnetic field

a)

True

b)

False

4.

Which part of an atom creates a magnetic effect?

a)

Neutron

b)

Proton

c)

Electron

5.

What is the formula for magnetic flux density?

a)

$Magnetic\ flux\ density=\frac{magnetic\ flux}{area}$

b)

$Magnetic\ flux\ density=magnetic\ flux\times area$

c)

$Magnetic\ flux\ density=\frac{magnetic\ flux}{\pi}$

d)

$Magnetic\ flux\ density=\frac{area}{magnetic\ flux}$

6.

What is the flux density in a rectangular core that is 8mm by 10mm if the flux is 4mWb?

a)

45T

b)

50T

c)

49T

d)

52T

7.

if two conductors were placed together with magnetic fields going the opposite direction, they would?

a)

Explode

b)

Attract

c)

Repel

d)

Solenoid

8.

If two conductors were placed together with magnetic fields in the same direction, they would?

a)

Repel

b)

Explode

c)

Solenoid

d)

Attract

9.

A three phase cable contains how many conductors carrying current in the same direction?

a)

1

b)

2

c)

3

d)

4

10.

True or False, If the current carrying conductor is coiled it creates a strong electromagnetic field

a)

True

b)

False

11.

True or False, Copper is a ferromagnetic material

a)

True

b)

False

12.

Iron is ferromagnetic which means what?

a)

The material itself becomes magnetic

b)

Its cooler than copper

c)

It is attracted to ferret magnets

d)

It sticks to copper

13.

What does the left hand rule help establish?

a)

If there is a magnetic field

b)

How fast the current is flowing

c)

The direction a current carrying conductor would move if in a magnetic field

d)

The amount of magnets

14.

If the angle of the conductor is $90\degree$ what is the formula for force applied to the conductor?

a)

$F=BIL+BEN$

b)

$F=BIL$

c)

$F=BIL\sin\theta$

d)

$F=\frac{B}{I}\times L$

15.

If the angle of the conductor is not $90\degree$ What is the formula for force applied to the conductor?

a)

$F=BIL\sin\theta$

b)

$F=\cos\theta\times BIL$

c)

$F=\frac{BIL}{\sin\theta}$

d)

$F=BIL-BEN$

16.

A conductor carries a current of 20A and is at a right angle to a magnetic field having a flux density of 0.9T. If the length of the conductor is 30cm, Calculate the force acting on the conductor

a)

4.5N

b)

5N

c)

5.4N

d)

5.5N

17.

What must move in order for induction to occur?

a)

Current

b)

Magnet

c)

Water

d)

Coil

18.

The magnetic field around the conductor induces what back into the current?

a)

a.m.f

b)

e.n.f

c)

a.b.c

d)

e.m.f

19.

What is the formula for back e.m.f if there is a change in flux?

a)

$e=-L\times\frac{\delta\psi}{\delta t}$

b)

$e=-N\times\frac{\delta\psi}{\delta t}$

c)

$e=-N+\delta t\times\delta\psi$

d)

$e=-N\times\frac{\delta t}{\delta\psi}$

20.

What is the formula for back e.m.f if there is a change in current?

a)

$e=-L\times I\times t$

b)

$e=-L+\frac{\delta t}{\delta I}$

c)

$e=-N\times\frac{\delta I}{\delta t}$

d)

$e=-L\times\frac{\delta I}{\delta t}$

21.

If two coils are brought close to each other, one of which has a current flowing through it, This is called what?

a)

Mutual Inductance

b)

Passing current

c)

Magnets

d)

e.m.f

Magnetism

Total questions: 21

Worksheet time: 5hrs 15mins

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