Electric Charge & Coulomb's law

Which particles experience an attractive force?

• Two neutrons

• A proton and an electron

• Two protons

• An electron and a neutron

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NGSS.HS-PS2-4

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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NGSS.HS-PS2-4

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NGSS.HS-PS1-3

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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What happens to the electric force between two charges when the distance is tripled?

• 3 times less electric force

• 3 time more electric force

• 9 times less electric force

• 9 times more electric force

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The figure shows a neutral glass rod and a positively charged metal sphere.

Which of the following best describes the movement of charges as this glass rod touches the sphere?

• Protons move from the sphere to the glass rod.

• Electrons move from the sphere to the glass rod.

• Electrons move from the glass rod to the sphere.

• Protons move from the glass rod to the sphere.

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What is the SI unit for charge?

• Joules

• Coulombs

• Newtons

• Meters

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Electrostatic force F is directly proportional to:

• r^2 (distance squared)
• q1
• q2
• both q1 and q2

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NGSS.HS-PS2-4

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

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

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Approximately how much force would be generated by two charged objects held 2 m apart, if q₁ has a charge of 3.0 C and q₂ has a charge of 4.0 C?

• 4.3 x 10¹¹ N

• 5.4 x 10¹⁰ N

• 2.7 x 10¹⁰ N

• 1.5 x 10⁹ N

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NGSS.HS-PS2-4

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

• k = 8.99·10^-9

• k = 9.8

• k = 6.67·10^-11

• k = 8.99 ·10⁹

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