Electricity and Magnetism

An electromagnet is a permanent magnet that does not switch on and off.

• True
• False

Resistance is the measure of how much a material opposes the flow of water.

• True
• False

What type of circuit has two or more paths that electricity can follow?

• Parallel
• Perpendicular
• Bilateral
• Triangular

This is an example of a _____ circuit.

• parallel
• series

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

• It must be heated by a source.

• 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 characteristics do magnetic substances have?

• Are always black and cold to the touch.

• Fall faster than other objects when dropped.

• Can push or pull objects they are not touching.

• Can give a shock when you touch them.

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The fact that a compass needle always points north tells us what?

• The solar rays affect magnetism.

• Most compasses need to be set.

• Earth is surrounded by a magnetic field.

• There is static eletricity in the air.

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

• It has a north and south pole.

• It is hundreds of miles long.

• It is shaped like Earth’s core.

• It is shaped like a horseshoe.

How would you explain to your friend how Earth’s magnetic field is similar to a bar magnet’s magnetic field?

• A bar magnet and the Earth are both round.

• A bar magnet is magnetic in the middle like Earth.

• A bar magnet is magnetic at the poles like Earth.

• A bar magnet and the Earth are both cylindrical.

Which of these best completes the circuit?

• rubber band
• metal nail
• leather shoelace
• wooden toothpick