Electric Forces Review

Coulomb's Law states that the electric force is directly proportional to the product of the two charges and inversely proportional to the distance between them. True or False?

• True

• False

• not enough information

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NGSS.HS-PS2-4

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.

You have two pairs of charged objects interacting with each other. The first pair (A and B) are 10 cm apart. A has a +1 charge and B has a -1 charge.

Pair C and D are 17cm apart. C has a +1 charge, and D has a -1 charge.

Which of these statements is true?

• There are no electric forces because the charges in each pair of objects cancel.

• The electric force between A and B is smaller than the electric force between C and D.

• The electric force between A and B is greater than the force between C and D.

• The electric force between A and B is identical in magnitude to the electric force between C and D.

In a stable atom the amount of electrons is equal to

• neutrons

• protons

• atomic mass

• neutrons + protons

What variable do "newtons" represent?

• Electrostatic Charge

• Force

• Distance

• Mass

If the distance doubles, what happens to the force?

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

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NGSS.HS-PS2-4

The graph shows the relationship between the force of interaction and the magnitude of charge. What type of relationship is this?

• Direct

• Indirect

• Inverse

• Reverse

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NGSS.HS-PS2-4

The image shows two charged particles with a force of 2.4 N. What would you predict the force of interaction would be when the magnitude of charge on q2 doubles?

• 9.6 N

• 4.8 N

• 1.2 N

• .6 N

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NGSS.HS-PS2-4

NGSS.HS-PS3-5

A charged balloon is brought near an electroscope but DOES NOT touch the electroscope.  This is an example of charging by

• Conduction
• Convection
• Friction
• Induction

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NGSS.MS-PS2-5