Static Electricity Test

Which of the following statements is true about electric forces?

• Electric forces cause objects to only attract each other.

• Electric forces cause objects to only repel each other.

• Electric forces cause objects to repel or attract each other.

• Electric forces have no effect on each other.

Three rods of different materials P, Q, and R, are charged by various methods. When the rods are brought near each other, the rods P and Q repel each other, while the rods P and R attract each other.

Which of the following could be the signs of the charges on the rods?

• Rod P and R are negative. Rod Q is positve.

• All three rods are negative.

• Rod P and Q are negative. Rod R is positive.

• Rod P is negative. Rod Q and R are positive.

Charging by _____ charges a neutral body by touching it with a charged body; whereas charging by _____ charges an object without touching it with a charged body.

• conduction; induction

• induction; conduction

• force; conduction

• force; induction

Electric forces can be either repulsive or attractive, whereas gravitational force is always:

• attractive

• repulsive

• both attractive and repulsive

• neither attractive nor repulsive

A region around charged objects where the object´s electric force is exerted on other charged objects is an electric: 

• Field
• Outlet
• Socket
• Power plant 

Which 2 variables affect the strength of electric force between 2 charged objects?

• distance between the objects and the total amount of charge

• distance and speed

• the total amount of charge and speed

• mass and speed

The closer the charges, the ___________ the force between them

• closer
• further
• stronger
• weaker

Two like charges:

•  neutralize each other.
• repel each other. 
• must be neutrons. 
• attract each other.

Something electricity can't move through is called a(n) ______.

• conductor
• wire
• shoe
• insulator

Which of the following statements is false about electric field lines

• electric field lines cannot cross
• electric field lines point away from positive charge
• electric field lines are always straight lines
• electric field lines show how a proton would move in an electric field