Electrostatics

When a plastic rod is rubbed with wool, why does the wool acquire a positive charge?

• Protons are transferred from the rod to the wool.
• Protons are transferred from the wool to the rod.
• Electrons are transferred from the rod to the wool.
• Electrons are transferred from the wool to the rod.

Sphere A carries a charge of +8 coulombs, and Sphere B carries a charge of -6 coulombs.  If the two are touched together and then separated, what will the charge on sphere A be?

• +1
• -1
• +2
• -2

When a rod is brought near a neutral electroscope, the leaves diverge.  Which statement best describes the charge on the rod?

• It must be positive.
• It must be negative.
• It may be positive or negative.
• It may be neutral.

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

A negatively charged rod is brought near a neutral electroscope, causing the leaves to diverge.  This is an example of....

• Conduction
• Induction
• Insulation
• Friction

If an object has an excess charge of -8.0x10^-19C, how many excess electrons does the object have?

• 2
• 3
• 4
• 5

If an object has an excess of 18 electrons, what is the charge on the object?

• 12.8x10^-19C
• 28.8x10^-19C
• 14.4x10^-19C
• 6.4x10^-19C

Which method of charging an object leaves both objects with the same charge?

• Friction
• Conduction
• Induction
• Electroscope

If a positively charged rod is brought near a neutral pith ball, what will the pith ball do?

• Move away from the rod
• Move toward the rod
• Do nothing
• Disappear 

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

If a negative rod is brought near a neutral electroscope, how will the electrons on the electroscope move?

• Toward the rod
• Away from the rod
• Onto the rod
• Away from the leaves

Tags

NGSS.HS-PS2-4

Balloon A simultaneously touches Balloons B and C.  Balloon A started with a charge of -4e, Balloon B started with a charge of +2e, and Balloon C started with a charge of +14e.  What will be the new charge on Balloon A after they were all allowed to touch?

• +12e
• +6e
• +8e
• +4e

Tags

NGSS.HS-PS3-5