Free Printable Chapter 18: Magnetism

1.

What will happen when these magnets are brought close together?

a)

They will attract each other.

b)

They will repel each other.

c)

Both magnets will turn to the left

d)

Both magnets will turn to the right

2.

Where is the strongest attraction force of the magnet?

a)

at the poles

b)

in the middle

c)

above the magnet

d)

below the magnet

3.

What does the following represent?

⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

a)

Multiplied by a billion

b)

A piece of modern art

c)

Uniform magnetic field directed into the screen away from you

d)

Uniform magnetic field directed out of your screen at you

4.

As the distance from a magnetic field increases

a)

The strength of the force increases

b)

The strength of the force decreases

c)

The strength of force is not effected by distance

d)

Magnetic fields do not have a force

5.

The SI unit of magnetic field is

a)

weber

b)

gauss

c)

tesla

d)

farad

6.

A wire carries a current out of the page. When viewed from above, what direction is the magnetic field?

a)

Out of the page

b)

Left

c)

Clockwise

d)

Counter-clockwise

7.

What does the following represent?
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙

a)

A crowd with binoculars

b)

A bunch of coaxial cables

c)

Uniform magnetic field directed into the screen away from you

d)

Uniform magnetic field directed out of your screen at you

8.

A moving charge produces ---- around it

a)

Current

b)

Magnetic field

c)

Force

d)

Light

9.

Find the direction of the magnetic force.

a)

Into the screen

b)

Out of the screen

c)

Right

d)

Left

10.

Find the direction of the magnetic force.

a)

Down

b)

Into the screen

c)

Out of the screen

d)

Up

11.

How is the direction of the force on a current-carrying wire related to the direction of the magnetic field?

a)

It is equal and opposite

b)

It is equal and parallel

c)

It is always perpendicular to the magnetic field

d)

It is always opposite to the magnetic field

12.

A wire connected to a circuit and coiled into many spiral loops is known as a _____________.

a)

Induced magnet

b)

solenoid

c)

magnetic moment

d)

forced electric field

13.

What does the direction of the pointing fingers mean in this picture? (right hand rule first version)

a)

the direction of the voltage

b)

the rotation of the wire

c)

the direction of the magnetic field

d)

the direction of the current

14.

Name one factor that does not affect the size of a force in on a current-carrying conductor placed in a magnetic field?

a)

Gravity

b)

Magnetic flux density/size of magnetic field

c)

Size of the current

d)

Length of the conductor

15.

No force acts on a current carrying conductor when it is placed-

a)

a. perpendicular to the magnetic field

b)

b. parallel to the magnetic field

c)

c. far away from the magnetic field

d)

d. inside a magnetic field

16.

When will a current carrying conductor placed in a magnetic field experience a zero force ?

a)

when placed parallel to magnetic field

b)

when placed perpendicular to magnetic field

c)

when placed aligned with the magnetic field

d)

when placed at an angle of 60⁰

17.

A particle carrying a charge of +e travels in a circular path in a uniform magnetic field. If instead the particle carried a charge of +2e, the radius of the circular path would have been ____.

a)

twice the original radius

b)

four times the original radius

c)

the same as the original radius

d)

one-half the original radius

e)

one-fourth the original radius

18.

In moving coil galvanometer, the pole faces of U-shaped magnet are made concave

a)

to make the field radial

b)

to increase the field

c)

to weaken the field

d)

both (a) and (b)

19.

In a moving coil galvanometer, the deflection of the coil Φ is related to the electric current i by the relation

a)

I ∝ tanΦ

b)

I ∝ Φ

c)

I ∝ Φ²

d)

I ∝ tan²Φ

20.

What is the direction of force for two parallel wires carrying current in the same direction

a)

Attract each other

b)

Repel each other

c)

Cancel their effect

d)

No effect on each other

21.

What is the equation of force for a charge moving in a uniform magnetic field?

a)

$F\ =\ BIl\ \sin\ \theta$

b)

$F\ =\ qvB\ \sin\ \theta$

c)

$F\ =\ \frac{mv^2}{r}$

d)

$F\ =\ \frac{\mu_0I_1I_2}{2\pi d}$

22.

What is the equation of force on a current-carrying conductor in a uniform magnetic field?

a)

$F\ =\ BIl\ \sin\ \theta$

b)

$F\ =\ qvB\ \sin\ \theta$

c)

$F\ =\ \frac{mv^2}{r}$

d)

$F\ =\ \frac{\mu_0I_1I_2}{2\pi d}$

23.

What is the equation of force between two parallel current-carrying conductors

a)

$F\ =\ BIl\ \sin\ \theta$

b)

$F\ =\ qvB\ \sin\ \theta$

c)

$F\ =\ \frac{mv^2}{r}$

d)

$F\ =\ \frac{\mu_0I_1I_2}{2\pi d}$

24.

Are the magnetic field lines in the picture correct?

a)

Yes, because they point from north to south.

b)

No, because they point from north to south (they're supposed to go the other way).

c)

Yes, because the North pole is on the left in all pictures.

d)

No, because the North pole is on the left in all pictures (it's supposed to be on the right).

25.

Which of the following statement is NOT TRUE about the magnetic field lines?

a)

Magnetic field lines are imaginary lines that cannot be directly observed

b)

Magnetic field lines continue inside a magnet

c)

Magnetic field lines always point out from the south pole towards the north pole of a magnet

d)

The number of lines per unit area is proportional to the strength of the magnetic field

26.

The shape of magnetic field around a long straight current carrying wire is

a)

Elliptical

b)

Square

c)

Rectangular

d)

Circular

27.

A proton of mass m and charge e is accelerated by a potential difference V. The proton is then deflected by a magnetic field B which is perpendicular to the motion of the proton. What is the radius of the trajectory of the proton

a)

$\frac{mv}{eB}$

b)

$\frac{B}{m}\sqrt{2eV}$

c)

$\frac{qv}{mB}$

d)

$\frac{B}{e}\sqrt{2mV}$

28.

The maximum torque on a current carrying loop occurs when the angle between the loop's magnetic moment and the magnetic field vector is

a)

$0\degree$

b)

$90\degree$

c)

$180\degree$

d)

None

29.

A current carrying wire lies between the poles of

two magnets, as shown. What is the direction of the force on the wire?

a)

Into the plane of the paper

b)

Out of the plane of the paper

c)

Towards the N-pole

d)

To the right

30.

What is the speed of a charged particle moving in magnetic and electric field?

a)

$v\ =\frac{x}{t}$

b)

$v\ =\ \frac{E}{B}$

c)

$v\ =\frac{B}{E}$

d)

$v\ =\ \frac{qBr}{m}$

31.

In a bainbridge mass spectrometer, a larger mass would result in

a)

A bigger radius

b)

A smaller radius

c)

Radius is not affected by the mass

d)

None of the above

32.

Magnetic field lines always cross.

a)

True

b)

False

33.

Looking at the field lines in this picture, these two magnets are ________

a)

Attracting

b)

Repelling

c)

Attracting and Repelling

d)

Doing nothing

34.

Two long, parallel wires each carry the same

current 𝐼 in the same direction. What is the total

magnetic field at the point 𝑃 midway between the

wires?

a)

Zero

b)

Directed into the page

c)

Directed out of the page

d)

Directed to the left

35.

What is the symbol for magnetic field strength?

a)

T

b)

M

c)

B

d)

F

36.

What is the unit for magnetic field strength?

a)

T

b)

M

c)

B

d)

F

37.

What is the shape of a magnetic field around the Earth?

a)

b)

c)

d)

38.

What is the shape of a magnetic field around a wire?

a)

b)

c)

d)

39.

Select the diagram with the weakest magnetic field

a)

b)

c)

40.

Magnetic force between two magnets gets weaker the more ________________ between them.

a)

distance

b)

attraction

c)

metal

d)

lightsabers

Chapter 18: Magnetism

Total questions: 40

Worksheet time: 30mins

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