ESL 5 Science / 12.5 Magnetism

ESL 5 Science / 12.5 Magnetism

Multiple Choice

When you have me, you can push or pull on another object that also has me.

• circuit

• magnetism

• metal

• rod

Multiple Choice

All magnets have two _____ -- north and south.

• irons

• magnetic fields

• metals

• poles

Multiple Choice

Like poles of a magnet repel each other, and unlike poles _____ each other.

• attract

• current

• push

• repel

Fill in the Blanks

I describe the strength and direction of a magnet's force. If you sprinkle iron filings near a magnet, you can see me.

Multiple Choice

The _____ together the lines of a magnetic field, the stronger the magnetic force.

• closer

• farther

• smaller

• straighter

Fill in the Blanks

I am magnetic when an electric current flows through me.

Multiple Choice

A magnetic field goes in _____ around a straight wire when current is flowing through it.

• circles

• pieces

• squares

• straight lines

Multiple Choice

You can increase the strength of an electromagnet in three ways: _____, place an iron rod inside the coils, or increase the current.

• decrease the current

• remove the iron rod

• straighten the wire

• wrap a wire

Fill in the Blanks

When my wire coils are spun between the poles of my powerful magnet, I produce electricity.

Multiple Choice

A generator creates an electric current by spinning a coil of wire between the poles of a powerful _____.

• axle

• magnet

• rod

• wire

Multiple Choice

The energy needed to spin the coils in an electric generator can come from _____ in a hydroelectric dam, rising steam in a coal-fired power plant, or from wind or tides.

• electromagnets

• falling water

• magnetic fields

• metal coils

Multiple Choice

I use magnetic forces to lift objects.

• generator

• magnetic levitation

• trains

• wires

Multiple Choice

Scientists have designed maglev trains that are held just above their tracks by electromagnets, greatly reducing the amount of energy lost to _____.

• engineers

• friction

• lift

• speed