Electricity & Magnetism Review

The north pole of one magnet attracts

• either the north or south pole of another magnet
• the south pole of another magnet
• the north pole of another magnet

Many electrical wires are wrapped with a plastic coating because plastic is

• less expensive than steel
• more dense than copper
• able to keep its shape
• a good insulator

How could someone separate aluminum nails from iron nails?

• heat the nails at high temperature until they melt
• put them in water to see which ones sink and float
• use a magnet to separate the nails
• shine a light on the nails to determine which are aluminum

The magnetic fields of any magnet are greatest

• around the poles
• around the middle of the magnet
• around the south pole only
• around the north pole only

To make an electromagnet, a conductor should be coiled around

• a wooden stick
• a roll of paper
• an iron nail
• a glass tube

Which of the following lists include only conductors of electricity?

• iron, wood, and paper
• iron, copper and steel
• plastic and paper
• wood, plastic and paper

The electrician in this picture is wearing rubber gloves for protection.The purpose of the rubber gloves is to

• keep the electrician dry
• produce electricity
• create an electrical circuit
• insulate the electrician

A boy pulls a sweater off over his head. His hair is attracted to the sweater due to

• pizza
• a chemical change
• a heat transfer
• an electrical charge

If you put a negative and a positive charge together they will

• do nothing
• attract
• repel

Which subatomic particle is negative?

• electron
• proton
• neutron