Waves, Electricity, & Magnetism

Which of the following would increase the strength of an electromagnet?

• Decrease the voltage by using a smaller power source

• Increase the number of turns or loops of wire around the core of the electromagnet.

• Use string as the wire material.

• Use a thinner wire.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What is/are the difference(s) between a magnet and an electromagnet?

• A magnet can be turned on/off.

• An electromagnet is stronger.

• An electromagnet can be turned on/off.

• Both A and B

• Both B and C

A _______________ transforms mechanical energy into electrical energy.

• magnetic field

• electromagnet

• electric motor

• generator

The area of magnetic force around a magnet is known as its ______________.

• magnet

• magnetism

• magnetic field

• electrical current

Tags

NGSS.MS-PS2-5

Electrons have what type of charge?

• positive

• negative

• neutral

• none of the above

Tags

NGSS.MS-PS2-3

Protons have what type of charge?

• positive

• negative

• neutral

• none of the above

_________________ is the attractive and repulsive forces between two poles.

• electrical forces

• electrical current

• magnetic forces

When _________ flow in a circuit, a current is produced.

• protons

• neutrons

• electrons

Tags

NGSS.MS-PS3-5

Opposite charges _________

• attract

• repel

• a and b

• none of the above

Tags

NGSS.MS-PS2-3

The North ends of two magnets will ______ one another.

• repel

• attract