Chapter 13: Electricity and Magnetism

What causes static electricity?

• only an object losing electrons

• only an object gaining electrons

• when positive and negative charges no longer balance

A ___________ charged object __________ a positively charged object.

• neutrally / repels

• positively / repels

• negatively / repels

Which of the following would be a good conductor for a closed circuit?

• wood

• copper

• rubber

Where is a magnetic field the strongest?

• at both poles

• in the middle

• at the south-seeking pole

A material that conducts electric current poorly is called __________.

• a circuit

• a charge

• an insulator

What would happen to the other bulbs in the circuit if one light bulb burns out?

• the other light bulbs will remain on

• the other light bulbs will go out

• the other light bulbs will be dimmer

Why does a compass needle point in a north-south direction?

• The needle reacts to Earth's magnetic poles.

• The needle forms an electromagnet with Earth's poles.

• The needle is lightweight, so it always spins to the south.

How can the strength of an electromagnet be increased?

• by using less current

• by using a smaller magnet

• by using more turns in the metal coil

What did Michael Faraday do when he discovered that changing a magnetic field created an electric current in a wire?

• He told no one of his investigation.

• He did not think he had discovered anything.

• He shared his investigation with other scientists.

What is produced when a coiled wire is spun around a magnet?

• electrical energy

• magnetic energy

• mechanical energy