Electrostatics Concepts

When you brush your hair you scrape off electrons, and your hair

• becomes positively charged
• becomes negatively charged
• becomes positively and negatively charged
• remains uncharged, or neutral

As a pair of charges is brought close together, the force between them

• Increases
• Decreases
• Increases only if they are the same sign
• Increases only if they are the opposite sign

Gravitational force depends on mass.  What comparable quantity governs the electrical force?

• Volume
• Density
• Charge
• Charge density

Which has more charge?

• Proton

• Electron

• Neither

What method of charging is depicted here?

• Induction
• Conduction
• Reduction
• Friction

What sign are the red and blue charges, from left to right?

• Positive, positive
• Positive, negative
• Negative, positive
• Negative, negative

A charge placed in the presence of an electric field at 1m would feel ____ at 2m.

• the same force
• double the force
• one half the force
• one quarter the force

What direction are the electric field lines around an electron?

• towards the charge
• away from the charge

What does it mean when the electric field lines are close together?

• the field is positive
• the field is negative
• The field is strong
• the field is weak

The electrostatic force between two charges located 2 meters apart is 0.10 N.  What will the force be between these charges when they are located 1 meter apart?

• 0.40 N
• 0.20 N
• 0.10 N
• 0.05 N