Coulomb's Law and Charge

An attractive force exists between which two particles?

• Two neutrons

• An electron and a neutron

• An electron and a proton

• Two electrons

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Coulomb's Law is __________ proportional.

• directly

• inversely

• polymetrically

• exponentially

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What will be the units of F (or F_e)?

• Newtons

• Meters

• Coulombs

• Joules

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Since Coulomb's Law is written as F_e=k\cdot\frac{q_1\cdot q_2}{d^2} this means that as the distance between the two charged objects gets smaller, the electric force ---

• gets weaker
  

• gets stronger
  

• changes unpredictably
  

• does not change
  

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NGSS.HS-PS2-4

What happens to the force between two charged objects when you double the distance between them?

• 2X

• 1/2X

• 4X

• 1/4X

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NGSS.HS-PS2-4

If one of the charges doubles, what happens to the force?

• it doubles

• it gets cut in half

• it quadruples

• it is cut by 1/4

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The force between two point charges is F when they are separated by a distance r.

If the separation is increased to 3r, what is the force between the charges?

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The image shows two charged particles with a force of 2.4 N. What would you predict the force of interaction would be when the distance doubles?

• 4.8 N

• 1.2 N

• .6 N

• .3 N

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NGSS.HS-PS2-4

Two charges pull on each other with 4.0 µN of force. If one charge is replaced with a charge 8× as big, and the distance is changed to 4× as much, the charges will pull on each other with --- of force.

• 2.0 µN

• 8.0 µN

• 4.0 µN

• 16.0 µN

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NGSS.HS-PS2-4

Which setup of charged particles shown below has the two exert the most force on one another?

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