Magnetic and Electric Forces

Which of the two below result in an attractive force?

• A positive charge and a negative charge

• Two negative charges

• Two south poles

• A north pole and a south pole

• Two postive charges

Static electricity is the buildup of charges between two objects. What best explains why a balloon is attracted to hair when the two have been rubbed together?

• The balloon and hair both have positive charges

• The balloon and the hair both have negative charges

• The balloon and the hair both have neutral charges

• The balloon and the hair both have opposite charges

Two bar magnets are held close together. They are released and allowed to move freely. The bar magnets quickly come together. Which best explains why this happens?

• The poles facing one another are both south poles

• The poles facing one another are both north poles

• The poles facing one another are opposite poles

• One magnet was bigger than the other

Frederick sets paper clips out on a table. He then takes a magnet, places it directly beneath the paper clips under the table, and moves the magnet. He finds that the paper clips move with the magnet. Why does this happen?

• Magnetic force is a repellant force

• Magnetic forces act on wood, like in the table

• The paper clips are feeling the gravitational force of the magnet

• Magnetic forces act at a distance, even betwewn objects

Surrounding each magnetic is an invisible force field called

• Gravity

• A magnetic field

• An electric field

• The Force

Atoms That have a positive charge will be attracted to atoms with a ______________ charge.

• positive

• negative

• no charge

This force occurs when there is an attractive and repulsive force between two poles.

• Electric

• Electromagnetism

• Magnetism

• Static Electricity

Like poles will

• Attract

• Repel

• Neither

The magnetic field of a magnet is ____________ further away from the magnet.

• Smaller

• Stroner

• Larger

• Weaker

Electric charges that do not move through a current are known as

• Electricity

• Static Electricity

• Magnetism

• Electromagnetism