The charge of an electron is

• positive
• negative
• there is no charge

Two like charges (a)   each other.

• repel
• attract
• neutralize

Protons and electrons

(a)  

• repel each other
• attract each other
• neutralize each other

Electrical forces between charges are strongest when the charges are

• constant
• close together
• far apart

If you comb your hair and the comb becomes negatively charged, your hair becomes (a)  

• uncharged
• positively charged
• negatively charged

A difference between electrical forces and gravitational forces is that electrical forces include (a)  

• infinite range
• repulsive interactions
• the inverse square law

What happens to the force between two charge particles if one of the charges increases in magnitude?

• The force increases.
• The force decreases.
• The force remains unchanged.

In a good insulator, electrons are usually (a)  

• not present.
• tightly bound in place.
• free to move around.

Metals are good conductors because their electrons are (a)  

• not present.
• tightly bound it place.
• free to move around.

A positive charge and a negative charge held near each other are released. As they move, the force on each particle

• increases
• decreases
• stays the same