Quiz about Magnetism and Electricity Review

Question 1

Which of the following are ferromagnetic elements?

Accepted Answer

all of the above

Answer

nickel

Answer

iron

Answer

cobalt

Question 2

When you break an iron magnet into two pieces, you get ____.

Accepted Answer

two north poles and two south poles

Answer

two south poles

Answer

two north poles

Answer

a piece of iron that is no longer magnetic

Question 3

What makes an electric motor spin?

Accepted Answer

The permanent magnet and the electromagnet continuously attract and repel each other.

Answer

The permanent magnet and the electromagnet have no effect on the spinning of the motor.

Answer

The permanent magnet and the electromagnet continuously repel each other.

Answer

The permanent magnet and the electromagnet continuously attract each other.

Question 4

Two objects will attract one another when they have ____.

Accepted Answer

opposite charges

Answer

like charges

Answer

no charge

Answer

the same amount of charge

Question 5

The magnetic _____ is the area around a magnet where the force acts. _______________

Accepted Answer

field

Answer

domain

Answer

pole

Answer

generator

Question 6

Unlike poles of a magnet ____________________.

Accepted Answer

attract

Answer

repel

Answer

cancel each other out

Question 7

An electric motor converts electrical energy into ____________________.

Accepted Answer

motion

Answer

magnetism

Answer

gravity

Answer

friction

Question 8

As the amount of charge on either of two charged objects increases, the electric force between the objects

Accepted Answer

increases

Answer

decreases

Answer

reverses

Answer

stays the same

Question 9

Which statement is false?

Accepted Answer

Current will not flow though a wire if the magnet is outside the coil.

Answer

The direction a coil of wire moves through a magnetic field determines the direction of the electric current.

Answer

The direction a magnet moves through a coil of wire determines the direction of the electric current.

Answer

Current will flow through a wire as long as the magnetic field around the coil s changing.

Question 10

The field of a magnet is weakest at its poles.

Accepted Answer

false

Answer

true

Question 11

An electric field gets stronger as you ____.

Accepted Answer

get closer to a charge

Answer

get farther from a charge

Answer

remove electrons from a negatively charged object

Answer

add electrons to a positively charged object

Question 12

Which statement is true?

Accepted Answer

As the electric current through a wire increases, the magnetic field around the wire becomes stronger.

Answer

As the electric current through a wire increases, the magnetic field around the wire is unaffected.

Answer

As the electric current through a wire decreases, the magnetic field around the wire becomes stronger.

Answer

As the electric current through a wire increases, the magnetic field around the wire becomes weaker.

Question 13

An electromagnet is made by placing a _______________ within a coil of wire with an electric current.

Accepted Answer

magnetic core

Answer

piece of wood

Answer

compass

Answer

balloon

Question 14

The more loops in a coil of wire around the core of an electromagnet, the _______ the magnetic force.

Accepted Answer

stronger

Answer

weaker

Answer

taller

Answer

shorter

Question 15

Which of the following conditions are necessary for a magnet inside a wire loop to produce an electric current?

Accepted Answer

The magnet must be in motion.

Answer

The wire loop must already have a current running through it.

Answer

The wire loop must be part of an open circuit.

Answer

The magnet must be stationary.

Question 16

The location of the strongest magnetic field is the ____.

Accepted Answer

magnetic poles

Answer

magnetic fields

Answer

magnetic domains

Answer

center of the magnet

Question 17

If the distance between two charged objects increases, the electric force between them _____.

Accepted Answer

decreases

Answer

increases

Answer

stays the same

Answer

stops

Question 18

How can a wire and a magnet create an electric current?

Accepted Answer

Both of the above

Answer

The magnet moves inside the coil of wire.

Answer

The coil of wire moves through a magnetic field.

Answer

None of the above

Question 19

Which of the following statements about the forces between charged objects is not true?

Accepted Answer

As the distance between charged objects decreases, the electric force between them decreases.

Answer

If one object is positively charged and another is negatively charged, the objects will attract each other.

Answer

Two positively charged objects will repel each other.

Answer

Two negatively charged objects will repel each other.

Question 20

For the electromagnet to attract and then repel the permanent magnet in the speaker, what has to happen?

Accepted Answer

The electric current must reverse directions.

Answer

The electric current must be turned off and on.

Answer

More coils must be added to the electromagnet.

Answer

Noises sent through the speaker must be very loud.

Question 21

The amount of positive charge on a proton equals the amount of negative charge on a neutron.

Accepted Answer

false

Answer

true

Question 22

Changing the current changes the ____ of an electromagnet.

Accepted Answer

strength and direction

Answer

charge

Answer

strength

Answer

direction

Question 23

Normally, atoms are electrically neutral because there are ____.

Accepted Answer

equal numbers of protons and electrons

Answer

more protons than electrons

Answer

more electrons than protons

Answer

equal numbers of protons and neutrons

Question 24

When you bring the south ends of two magnets close together, they repel each other.

Accepted Answer

true

Answer

false

Question 25

An electromagnet is ____.

Accepted Answer

only operating when the current is on

Answer

able to attract all metal substances

Answer

made with bar magnets

Answer

a permanent magnet

Question 26

The strength of an electromagnet can be increased by reducing the number of turns on the wire coil so that more current can flow.

Accepted Answer

false

Answer

true

Question 27

A current-carrying wire produces a magnetic field.

Accepted Answer

true

Answer

false

Question 28

The south pole of a magnet ____.

Accepted Answer

attracts a north pole

Answer

repels a north pole

Answer

repels a paper clip

Answer

attracts another south pole

Question 29

Two types of electric charges exist, positive and negative.

Accepted Answer

true

Answer

false

Question 30

Which of the following describes both an electromagnet and a permanent magnet?

Accepted Answer

It has a north pole and a south pole.

Answer

The magnetic force can be turned off and on.

Answer

The strength of the magnetic force can be controlled.

Answer

The poles can be reversed.

Question 31

Because of the magnetic field, magnets do have to touch to affect each other.

Accepted Answer

<p>false</p>

Answer

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