Coulomb's Law and Electric Forces Explained

What is the charge of a proton?

• 0 coulombs

• -1.6 x 10^-19 coulombs

• 1.6 x 10^19 coulombs

• 1.6 x 10^-19 coulombs

According to Coulomb's Law, what happens to the electric force if the distance between two charges is doubled?

• It remains the same

• It doubles

• It halves

• It becomes one-fourth

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NGSS.HS-PS2-4

What is the value of the proportionality constant k in Coulomb's Law?

• 3 x 10^8 N m^2/C^2

• 8.85 x 10^-12 N m^2/C^2

• 9 x 10^9 N m^2/C^2

• 1.6 x 10^-19 N m^2/C^2

Tags

NGSS.HS-PS2-4

If the magnitude of one of the charges is doubled, what happens to the electric force between the charges?

• It doubles

• It halves

• It becomes one-fourth

• It remains the same

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NGSS.HS-PS2-4

What is the unit of electric charge?

• Watt

• Newton

• Coulomb

• Joule

Convert 1 microcoulomb to coulombs.

• 1 x 10^-3 coulombs

• 1 x 10^-6 coulombs

• 1 x 10^-9 coulombs

• 1 x 10^-12 coulombs

Calculate the magnitude of the electric force between a 10 microcoulomb charge and a -20 microcoulomb charge separated by 25 cm.

• 14.4 N

• 28.8 N

• 7.2 N

• 3.6 N

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NGSS.HS-PS2-4

How far apart are two charges of 800 nC and 900 nC if the electric force between them is 15 N?

• 2.078 cm

• 20.78 cm

• 0.2078 cm

• 207.8 cm

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

What is the net electric charge on a metal sphere with 4.3 x 10^21 protons and 6.8 x 10^21 electrons?

• -80 C

• 400 C

• -400 C

• 80 C

What is the net electric force acting on a 100 microcoulomb charge placed at the origin, with a -50 microcoulomb charge at x=2m and a 200 microcoulomb charge at x=-4m?

• 8.75 N

• 11.25 N

• 2.5 N

• 22.5 N

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5