Electricity and Magnetism Review

What causes static electricity?

• When positive and negative charges balance.

• When an object gains electrons

• When positive and negative charges no longer balance.

A charge in motion is a(n)_________________

• series circuit

• electromagnet

• electric current

A _________ object _____________ a positively charged object.

• negatively charged, repels

• positively charged, repels

• neutrally charged, repels

Which of the following is a good conductor for a closed circuit?

• copper

• wood

• rubber

Current flows in only one direction in a(n)

• series circuit

• parallel circuit

Because of Earth's ________, a compass needle points in a north-south direction.

• magnetic field

• resistance

• magnetism

A material that conducts electric current poorly is called________

• a circuit

• an insulator

• a charge

What would happen to the other light 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 brigther.

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

• The needle forms an electromagnet

• The needle reacts to Earth's magnetic poles.

• The needle is pulled in the middle by Earth's equator.

How can the strength of an electromagnet be increased?

• by using a smaller magnet.

• by using more turns in the metal coil

• by using less current