How can the strength of an electromagnet increase?

Add more loops (coils) of wire around the iron nail

Remove loops (coils) of wire from around the iron nail

Remove the iron nail, leaving only the coils of wire

What is magnetic force?

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

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. 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?

The spoon now picks up seven paper clips.

More wire was needed to wrap around the spoon.

Eventually, the battery runs out of energy.

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

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?

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

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

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

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

The table provided shows data collected by students during an investigation of two electromagnets. Which of the following conclusions is supported by data on the table?

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

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

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

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

This table shows the magnitude of electromagnetic force exerted by two electromagnets on each other as the distance between the two electromagnets is varied. The data on the table provide evidence for which of the following conclusions?

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

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

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

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

A directional flow of electrical charge through an object or medium

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

Attractive or repulsive interactions between any two charged objects

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

The attraction will be stronger.

The repulsion will be stronger.

Nothing will happen to the electric field.

What is an electric force?

Attractive or repulsive interactions between any two charged objects

A directional flow of electrical charge through an object or medium

What is magnetic strength?

Attractive or repulsive interactions between any two charged objects

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

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

They will repulse (repel) each other.

Electricity and Magnetism

Authored by Anna Anderson

Science

8th Grade

NGSS covered

Used 431+ times

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21 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do objects become positively charged?

They gain electrons

They lose electrons

Rubbing or Friction

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do objects become negatively charged?

They gain electrons

They lose electrons

Rubbing or Friction

This is a measure of electrical pressure

Current

Volt

Ohm

Ampere

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

This is the measure of the movement of the electric charge

Voltage

Volt

Ohm

Ampere

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

This is a measure of electrical resistance

Current

Volt

Ohms

Ampere

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Force resulting from interaction between electrically charged particles

Magnetic Force

Electromagnetic Force

Electric Force

Current

The size or quantity of something

Magnetic Force

Magnitude

Electromagnetic Force

Current

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Electricity and Magnetism

How do objects become positively charged?

How do objects become negatively charged?

This is a measure of electrical pressure

This is the measure of the movement of the electric charge

This is a measure of electrical resistance

Force resulting from interaction between electrically charged particles

The size or quantity of something

As the distance between magnets increases-the attraction between them will

How can the strength of an electromagnet increase?

What is magnetic force?

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