Coulomb's Law

What variable is a Coulomb the unit for?

• Charge
• Force
• Distance
• Mass

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

• 2X
• 1/2X
• 4X
• 1/4X

Coulomb’s law states that the force between two charged objects will __________ when the magnitude of the object’s charge increases.

Coulomb’s law also states that the force between two charged objects will __________ when the distance between objects increases.

• increase; increase

• increase; decrease

• decrease; increase

• decrease; decrease

Why are there two q's in the equation?

• because there are two charged objects

• because there are protons and electrons

• because the particles are moving away from each other

• because the particles are moving towards each other

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?

• 0.5 N

• 1.5 N

• 3 N

• 6 N

A 5 C and 8 C are 8 m apart. What is the force between them?

• 5.625 x 10⁹

• 5.625 x 10^-9

• 4.5 x 10¹⁰

• 4.5 x 10^-10

A charge of 4 C and -7 C are 200 m apart. What is the force between them?

• 6.3 x 10⁶

• -6.3 x 10⁶

• 2.52 x 10¹¹

• -2.52 x 10¹¹

Find the magnitude of the force between two charges of 1.0 C each which are 1.0 meter apart?

• 9E-9 N
• 9E9 N
• 1.1E10 N
• 1.1E-10 N

Calculate the force exerted between two charged objects separated by a distance of 0.6 m. One object has a charge of -5 C and the other has a charge of +2.0 C.

• -1.5E-11 N
• 2.5E-11 N
• -2.5E11 N
• -7.5E-10 N

A point charge of +3.0 X 10^-7 coulomb is placed 2.0 X 10^-2 meter from a second point charge of +4.0 X 10^-7 coulomb. What is the magnitude of the electrostatic force on the charges?

• 6.0 X 10^-12 N

• 3.0 X 10^-10 N

• 5.4 X 10^-2 N

• 2.7 N