Electricity and Magnetism

Do magnets have to make contact with an object to attract or repel it?

• Yes

• No

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

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?

• More wire was needed to wrap around the spoon.

• The spoon now picks up seven paper clips.

• Eventually, the battery runs out of energy.

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

Tags

NGSS.MS-PS2-3

The illustration shows a hand generator. Turning the handle of the generator spins a magnet and creates an electric current that lights the bulb. Which of the following observations can be used to indicate the strength of the current created by the generator?

• The brightness of the bulb

• The size of the magnet

• The length of the handle

• The mass of the generator

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

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

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

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

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What is a current?

• A directional flow of electrical charge through an object or medium

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

• The size or quantity of something

• Attractive or repulsive interactions between any two charged objects

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

• The repulsion will be stronger.

• The attraction will be stronger.

• The attraction will be weaker.

• Nothing will happen to the electric field.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A current flowing through a wire is surrounded by a

• Electric Current

• Magnetic Field

• Electric Field

• None of these

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

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

• Both magnets will get weaker.

• They will repulse (repel) each other.

• They will attract each other.

• Nothing will happen.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Describe one way you can make an electromagnet stronger.

• Reduce the size of the iron core

• Decrease the current

• Decrease the energy source

• Increase the number of loops in the wire

The buildup of charges on an object is called

• Current electricity

• Static electricity

• Electromagnetism

• Magnetic field