Electric F, E

If the distance between 2 charges doubles, what happens to the electrostatic force?

• Reduced by half
• Reduced by 1/4
• Stays the same
• Quadruples

A balloon has a negative charge.  The glass rod has a positive charge.  What will happen when the glass rod is brought near the balloon?

• The balloon will be attracted to the rod
• The balloon will be repelled by the rod
• The balloon will remain in place
• The balloon will spin in circles

Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.

• +,+
• +,-
• -,+
• -,-

Calculate the force exerted between two charged objects separated by a distance of 0.6 m. One object has a charge of -5 C and the other has a charge of +2.0 C.

• -1.5E-11 N

• 2.5E11 N

• -2.5E11 N

• -7.5E-10 N

When you walk across a carpet in socks, they pick up charges. Later, there aren't any charges in your socks. what probably happened to the charges?

• The charges disappeared.

• The charges switched signs.

• The charges transferred to another object.

• The charges broke apart into smaller particles.

You have 2 circular objects, and each has a positive charge near each other, but not touching. Which statement describes the force that is exerted on the objects due to their electric charge?

• There is a force pushing both objects to the left.

• There is a force pulling the objects toward each other.

• There is a force pushing the objects away from each other.

• There is no force on the objects due to their electric charge.

Before the balloons and sweaters are rubbed together, both objects are __________ charged. After they are rubbed together the sweater is __________ charged and the balloon is ___________ charged

• negative/positive/negative

• neutral/positive/negative

• positive/negative/neutral

• neutral/negative/positive

A student rubbed two nonmetal rods, each of a different material, with two different cloths. He found that the two rods then attracted each other. What is the most likely explanation?

• The combination of rods and cloths put positive charges onto one rod and negative charges onto the other.

• The combination of rods and cloths put positive charges onto both of the rods.

• The combination of rods and cloths put negative charges onto both of the rods.

• Both rods were neutral.

Four charges are placed on the corners of a rectangle as shown. If a positive charge is placed exactly at the center of the rectangle, what would happen to it?

• It will move upward.

• It will not move.

• It will move diagonally to the lower right corner.

• It will move to the right.

In the figure, what is the sign of the charges Q1 and Q2, respectively?

The arrows point towards Q1, so it must be a negative charge, and away from Q2, so it must be a positive charge.

• positive and positive

• positive and negative

• negative and positive

• negative and negative