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.

Attractive or repulsive interactions between any two charged objects

What affects the strength of an electrical field?

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

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.

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?

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.

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?

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. (See Attached Diagram) 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.

8th Electric and Magnetic Forces

Authored by Andrea Edwards

Science

8th Grade

NGSS covered

Used 229+ times

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Remove the core, leaving only the coils of wire.

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

Remove the battery.

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

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NGSS.MS-PS2-3

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8th Electric and Magnetic Forces

The size or quantity of something

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

A directional flow of electrical charge through an object or medium

Force resulting from interaction between electrically charged particles

Magnetic strength

Magnetic force

How can the strength of an electromagnet increase?

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

Electric force

As the distance between magnets increases, the attraction between them will –

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