Electrostatics

Consider the conduction charging shown. 

• Electrons move from the insulating stand into the sphere.
• Protons move from the bar into the sphere.
• Electrons move from the charged metal bar into the sphere.
• Protons move from the sphere into the negatively charged bar.

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A glass rod becomes positively charged when it is rubbed with silk. This net positive charge accumulates because the glass rod

• gains electrons
• loses electrons
• gains protons
• loses protons

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Two like charges

•  neutralize each other.
• repel each other. 
• must be neutrons. 
• attract each other.

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An atom loses an electron.  What type of charge does it have now?

• positive
• negative

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Where do electrons go when you rub a balloon on your hair?

• Onto the balloon
• Into your hair
• Nowhere

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Which two particles are attracted to each other?

• Two neutrons

• A proton and an electron

• Two protons

• An electron and a neutron

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A repulsive force exists between which two particles?

• Two neutrons

• An electron and a neutron

• An electron and a proton

• Two protons

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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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When distance increases, electrostatic force ____________; we call this relationship ____________ proportional

• decreases;directly
• decreases;inversely
• increases;inversely
• increases;directly

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Which is the value of the constant in Coulomb's equation?

• k = 9·10^-9

• k = 9.8

• k = 6.67·10^-11

• k = 9 ·10⁹

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