SUPSCIREVIEW

What characteristics do magnetic substances have?

• They can give a “shock” when you touch them.

• They can push or pull objects they are not touching.

• They are always black and cold to touch.

• They fall faster than other objects when you drop them.

If you break a bar magnet in half, each half

• becomes a bar magnet with two poles.

• becomes unmagnetized.

• contains one magnetic pole.

Magnetic field strength is

• strongest close to a magnet.

• constant everywhere around a magnet.

• strongest far from a magnet.

Magnetic field lines surrounding a magnet are conventionally drawn

• from south to north.

• from north to south.

• from north to south.

If the north pole of one magnet is brought near the south pole of another magnet, the poles will

• repel each other.

• attract each other.

• not interact with each other at all.

What substance is attracted to a magnet?

• silver

• lead

• water

• iron

What must happen for an electromagnet to have a magnetic field?

• It must be heated.

• It has to be touching another magnet.

• It must be lined up with Earth’s magnetic field.

• It must be connected to an electrical source.

What happens when two north poles of magnets are placed together?

• They repel.

• They attract

• They cancel each other out.

• The strength of the magnet is doubled.

How is Earth’s magnetic field similar to that of a magnet?

• It has North and South poles.

• It is hundreds of miles long.

• It is made in Earth’s core.

• It is shaped like a horseshoe.

How is Earth’s magnetic field similar to that of a magnet? A. It has North and South poles. B. It is hundreds of miles long. C. It is made in Earth’s core. D. It is shaped like a horseshoe.

• All things fall toward Earth’s center.

• A compass needle lines up with it.

• Winds blow from east to west.

• Earth’s oceans all have currents