Electrostatics and Forces

When an object gains electrons it becomes __________

• Neutral

• Positively charged

• Negatively charged

Rubber¸ plastic¸ glass and dry air are examples of

• conductors

• Insulators

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Copper, humans, and minerals like salt and calcium are examples of

• conductors

• Insulators

A balloon is rubbed against a student's hair and then touched to a wall. The balloon sticks to the wall due to

• The balloon is charged neutral, so is the wall, so it attracts to the wall

• The balloon is charged opposite the wall, so it attracts to the wall

• The balloon has a charge, so it attracts the neutral wall

• The wall grounds the balloon, so it sticks

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Why does the child's hair stick up?

• The boy is grounded since he's at the bottom of the slide

• He gained a charge from the slide, and since he's not grounded, his hairs have the same charge so they repel one another

• He gained a charge from the slide, and since he's not grounded, his hairs have opposite charges so they repel one another

• When hair is neutral, some have a positive side and some have negative side, so they will attract to each other, making it stand up

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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

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As two oppositely charged particles approach each other, what happens to the electrical force between them?

• The attractive force increases

• The magnitude of the electric force decreases

• The repulsive force increases

• The magnitude of their charges increases

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The Electric Force is strongest when charges are...

• close together
• far apart
• the electric force is constant everywhere

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What variable is a Coulomb the unit for?

• Charge
• Force
• Distance
• Mass

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How strong is the attractive force between a glass rod with a 0.700μC

charge and a silk cloth with a –0.600μC

charge, which are 12.0 cm apart, using the approximation that they act like point charges?

• -3.5 x 10^-2 N

• -263 N

• -0.263 N

• -3.5 x 10² N

• -0.315 N

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