APC Electrostatics (Forces & Fields)

A plastic rod is rubbed with a piece of wool. During the process the plastic rod acquires a positive charge and the wool

• acquires an equal positive charge

• acquires an equal negative charge

• acquires a smaller positive charge

• acquires a smaller negative charge

• remains neutral

Which of these could be the charge on an object?

• 0.40 mC

• 4.8 mC

• 5.0 C

• 6.5 C

• All of the above

Tags

NGSS.HS-PS2-4

A conducting sphere is charged with a negative charge -Q. Which statement about the charge distribution is correct?

• Charge is concentrated at the center of the sphere

• Charge is concentrated at the bottom part of the sphere

• Charge is evenly distributed throughout the entire volume of the sphere

• Charge is evenly distributed on the surface of the sphere

• more information is required

Tags

NGSS.HS-PS2-4

An insulated sphere is charged uniformly with a positive charge +Q. Which statement about the charge distribution is correct?

• Charge is concentrated at the center of the sphere

• Charge is concentrated at the bottom part of the sphere

• Charge is evenly distributed throughout the entire volume of the sphere

• Charge is evenly distributed on the surface of the sphere

• More information is required

A positively charged sphere is brought near end A of the uncharged metal bar shown below. Ends A and B of the metal bar will be charged:

• positive, negative

• negative, positive

• positive, positive

• negative, negative

• neutral, neutral

Tags

NGSS.HS-PS3-5

A neutral electroscope is touched by a positively charged rod and then the rod is removed. Then a negatively charged rod is brought close to the electroscope. What happens to the leaves of the electroscope?

• they move farther apart

• they move closer together

• they remain the same distance apart

• More information is required

A physics student wants to determine the polarity of an initially charged electroscope in the lab. She has two oppositely charged rods and brings each one separately near the electroscope. The positive rod causes the leaves to move farther apart and the negative rod causes the leaves to move closer together. What type of charge is on the electroscope?

• positive

• negative

• neutral

• cannot be determined because the electroscope wasn't grounded

• Cannot be determined because the rods were not neutral

Two charged objects with an equal charge of Q are separated by a distance r and attract each other with a certain force. If the charges on both objects are doubled and the separation is halved, the force between them will be

• 4 times greater

• 2 times greater

• 4 times less

• 16 times greater

• 16 times less

Tags

NGSS.HS-PS2-4

Two identical conducting spheres are charged to +Q and -3Q and separated by a distance r. The attractive force between the spheres is F. The two spheres are brought in brief contact and then moved to their original positions. If the new electrostatic force between the spheres is F', which of the following is true?

• F = F'

• F' = 3F

• F' = F/3

• F' = 9F

• F' = F/9

Tags

NGSS.HS-PS2-4

An electric charge Q is placed at the origin. If the magnitude of the electric field at point A is E, what is the electric field at point B?

• 4E

• 2E

• E

• E/2

• E/4

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5