Quiz about 8th Electric and Magnetic Forces

Question 1

The size or quantity of something

Accepted Answer

Magnitude

Answer

Electromagnetic force

Answer

Magnetic strength

Answer

Electric force

Question 2

What will happen if the north ends of two magnets are placed near each other?

Accepted Answer

They will repulse (repel) each other.

Answer

They will attract each other.

Answer

Both magnets will get weaker.

Answer

Nothing will happen.

Question 3

A directional flow of electrical charge through an object or medium

Accepted Answer

Current

Answer

Magnitude

Answer

Magnetic force

Answer

Electromagnetic force

Question 4

Force resulting from interaction between electrically charged particles

Accepted Answer

Electromagnetic force

Answer

Current

Answer

Magnetic strength

Answer

Magnetic force

Question 5

Magnetic strength

Accepted Answer

How strong a magnet is

Answer

Attraction or repulsion that arises between electrically charged particles because of their motion

Answer

Force resulting from interaction between electrically charged particles

Answer

A directional flow of electrical charge through an object or medium

Question 6

Magnetic force

Accepted Answer

Attraction or repulsion that arises between electrically charged particles because of their motion

Answer

How strong a magnet is

Answer

Force resulting from interaction between electrically charged particles

Answer

The size or quantity of something

Question 7

How can the strength of an electromagnet increase?

Accepted Answer

Add more loops (coils) of wire around the core.

Answer

Remove the core, leaving only the coils of wire.

Answer

Remove the battery.

Answer

Remove loops (coils) of wire from around the core.

Question 8

What will happen as an electron (-) gets closer to a proton (+)?

Accepted Answer

The attraction will be stronger.

Answer

The repulsion will be stronger.

Answer

The attraction will be weaker.

Answer

Nothing will happen to the electric field.

Question 9

Electric force

Accepted Answer

Attractive or repulsive interactions between any two charged objects

Answer

Attraction or repulsion that arises between electrically charged particles because of their motion

Answer

Force resulting from interaction between electrically charged particles

Answer

The size or quantity of something

Question 10

What affects the strength of an electrical field?

Accepted Answer

The distance from the source

Answer

Both the quantity of the charge and the distance from the source

Answer

None of these

Answer

The quantity of the charge

Question 11

Students want to investigate how the amount of electric energy delivered to a motor affects its speed. Which of the following procedures will most likely produce the data students need to answer their question?

Accepted Answer

Measure the rotations per second of a motor when it is connected to one battery, two batteries, and three batteries.

Answer

Add larger and larger motors to a battery to determine the size of the largest motor the battery is able to run.

Answer

Closely observe the rotation of the motor to see if the direction of spin reverses when the poles of the battery are switched.

Answer

Connect a series of motors to the same battery to figure out how many motors can be run off the same battery.

Question 12

Students attached both ends of a long wire to the poles of a battery and wrapped the wire around a spoon. In this arrangement, the spoon is able to pick up five paper clips.

(See Attached Diagram)

The students wrap more wire around the spoon and want to determine if the strength of the magnetic force has increased. Which of the following observations would indicate that wrapping more wire has increased the strength of the electromagnet?

Accepted Answer

The spoon now picks up seven paper clips.

Answer

More wire was needed to wrap around the spoon.

Answer

Eventually, the battery runs out of energy.

Answer

The ends of the wire must touch the battery's poles.

Question 13

The table provided shows data collected by students during an investigation of two electromagnets.

(See Attached Diagram)

Which of the following conclusions is supported by data on the table?

Accepted Answer

The greater the charges of two electromagnets, the greater the size of the force.

Answer

When two electromagnets are of like charges, they attract each other.

Answer

Electromagnets that repel each other have more force than those that attract each other.

Answer

If the charge on one magnet is positive, the charge on the other must be negative.

Question 14

The illustration shows a hand generator. Turning the handle of the generator spins a magnet and creates an electric current that lights the bulb.

(See Attached Diagram)

Which of the following observations can be used to indicate the strength of the current created by the generator?

Accepted Answer

The brightness of the bulb

Answer

The size of the magnet

Answer

The length of the handle

Answer

The mass of the generator

Question 15

This table shows the magnitude of electromagnetic force exerted by two electromagnets on each other as the distance between the two electromagnets is varied.

(See Attached Diagram)

The data on the table provide evidence for which of the following conclusions?

Accepted Answer

The smaller the distance between two electromagnets, the greater the force.

Answer

The force between any two magnets is always constant, regardless of distance.

Answer

As distance between electromagnets increases, the electromagnetic force also increases.

Answer

The force between two magnets depends only on the charge of the electromagnets.

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science