Chapter 20 Lesson 2 Making Magnets with an Electric Current

1.

Multiple Choice

15 mins

1 pt

Electronic devices create magnetic fields because they

are magnets

are compasses

have moving particles with electric charge

2.

Multiple Choice

15 mins

1 pt

How can you test to see if there is a current running through a wire?

listen carefully to see if you hear a buzzing sound

place several compasses around the wire

place several batteries around the wire

3.

Multiple Choice

15 mins

1 pt

The electromagnetic forces from a current carrying wire are strong enough to move the compass needle. The forces can be made stronger by

making the wire shorter

making the wire longer

making the wire into loops

4.

Multiple Select

15 mins

1 pt

What THREE ways are electromagnets different from permanent magnets?

they can be turned off and on

they can increase in strength by increasing the current in the wire

they are smaller in size

they can change which is the north and south pole

5.

Multiple Choice

15 mins

1 pt

Electromagnets are useful in industry such as a junk yard because they

have strong north and south poles

are easy to lift

can be turned off and on

6.

Multiple Select

15 mins

1 pt

Permanent Magnets and Electromagnets are similar in which TWO ways?

it can be turned off and on

they both have a north and south pole

they are surrounded by a magnetic field

7.

Multiple Choice

30 sec

1 pt

Increasing the number of coils in an electromagnet will _________ the strength of the magnet.

decrease

increase

not affect

8.

Multiple Choice

30 sec

1 pt

An electric current produces

a magnetic field.

an electromagnet.

a solenoid.

an insulator.

9.

Multiple Choice

2 mins

1 pt

What device is made of coils of wire with an electrical current passing through it in order to generate a magnetic field?

Electromagnet

Generator

Electron Magnet

Motor

10.

Multiple Choice

2 mins

1 pt

How are electromagnets different from magnets?

magnets can be turned on/off

you can turn an electromagnet on/off

magnets are more powerful

magnets have a North and South pole

11.

Multiple Choice

30 sec

1 pt

True or False: A magnetic field is invisible.

True

False

12.

Multiple Choice

5 mins

1 pt

What is the device seen here?

generator

electric motor

electromagnet

magnet

13.

Multiple Choice

30 sec

1 pt

The field around the wire becomes ______ if the current in the wire increases.

stronger

weaker

14.

Multiple Choice

5 mins

1 pt

A(n) ______ is a device that uses an electric current to produce motion.

generator

electric motor

electromagnet

magnet

15.

Multiple Choice

5 mins

1 pt

When a(n) ______ is supplied to the motor, the unlike poles of the permanent magnet and the electromagnet attract each other, causing the motor to turn.

magnetic force

electric current

commutator

magnet

16.

Multiple Choice

15 mins

1 pt

What is the name of a magnet created by wrapping a current-carrying wire around a ferromagnetic core?

Electromagnet

Magnetic Pole

Voltage

Electric Current

17.

Multiple Choice

15 mins

1 pt

Any attraction or repulsion between magnets is called...

Electric Resistance

Electric Current

Magnetic Force

Voltage

18.

Multiple Choice

2 mins

1 pt

What can you use to make an electromagnet?

Battery, nail and string

Battery, pencil and wire

Wire, battery and iron ore (nail)

Peanut butter, lampshade, hand sanitizer

19.

Multiple Choice

30 sec

1 pt

When two magnets attract, they ______________

push apart

change color

get colder

pull together

20.

Multiple Choice

30 sec

1 pt

When two magnets repel, they ________________

change color

pull together

push apart

get colder

21.

Multiple Choice

2 mins

1 pt

If you hold two magnets with the same poles (N to N, or S to S) together, the magnets will ___.

attract each other

cancel each other's magnetic field

both point to Earth's North Pole

repel each other

22.

Multiple Choice

15 mins

1 pt

What is the name for any object that attracts the metal iron?

Magnet

Circuit

Conductor

Insulator

23.

Multiple Choice

30 sec

1 pt

Magnets have a north and a south ___________

shape

color

pole

region

24.

Multiple Choice

30 sec

1 pt

What would we call a nail that can pick up a paperclip because it is touching a magnet?

temporary magnet

poles

force

detector

25.

Multiple Choice

30 sec

1 pt

A circuit MUST be _______ in order for the current to flow

open

closed

26.

Multiple Choice

30 sec

1 pt

The geographical and magnetic poles are in the same place.

True

False

27.

Multiple Choice

30 sec

1 pt

Magnetic poles have magnetic field lines that start at the ______ magnetic pole and end at the ________ magnetic pole.

north, south

south, north

north, north

south, south

28.

Multiple Choice

1 min

1 pt

The relationship between electricity and magnetism is called

scary

magnet role reversal

electromagnetism

magneteel

29.

Multiple Choice

1 min

1 pt

When magnetic field lines are drawn, how do they look?

straight lines

criss-crossed lines like X's

curved lines from N to S pole and outwards

lines extending outward in all directions like drawing the Sun

30.

Multiple Choice

1 min

1 pt

What is the role of the ferromagnetic core in an electromagnet?

It changes the direction of the current

It increases the strength of the electromagnet

It turns the magnetic field on and off

It closes an electrical circuit in the electromanget

31.

Multiple Choice

1 min

1 pt

Electric motors use _____ to turn electricity into motion.

magnets

wires

batteries

32.

Multiple Choice

1 min

1 pt

Which image would produce a stronger electromagnet?

50 coils

100 coils

150 coils

200 coils

33.

Multiple Choice

30 sec

1 pt

What are the 3 ferromagnetic elements?

copper, nickel, iron

iron, aluminum, copper

nickel, iron, cobalt

iron, cobalt, copper

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