Coulomb’s Law Practice Problems

1) The symboldin Coulomb's law equation represents the distance from ___.

a) A to B / b) A to D / c) B to C / d) B to D
e) C to D / f) A to G / g) B to F / h) C to E

2) Theqin Coulomb's law equation stands for the _____.

a. mass of a charged object / b. # of excess electrons on the object
c. the current of a charged object / d. the distance between charged objects
e. charge of a charged object

3) What happens to the force between two charges when the distance between them triples?

A) it also triples B) it decreases by a factor of 3

C) It increases by a factor of 9 D) it decreases by a factor of 9

4) What happens to the force between two charges if the distance between them is quadrupled?

A) it also quadruples B) it increases 16 times

C) it decreases by a factor of 4 D) it decreases 16 times

5) What happens to the force between two charges if the distance between them is cut in half?

A) it is also cut in half B) it doubles

C) it decreases by a factor of four D) it increases by a factor of four

6) What happens to the force between two charges if the magnitude of one of them is doubled?

A) it is also cut in half B) it doubles

C) it decreases by a factor of four D) it increases by a factor of four

7) What happens to the force between two charges if the magnitude of both of them is doubled?

A) it is also cut in half B) it doubles

C) it decreases by a factor of four D) it increases by a factor of four

8) What happens to the force between two charges if the magnitude of both charges is doubled and the distance between them is doubled?

A) it decreases by a factor of four

B) it doubles

C) it increases by a factor of four

D) it stays the same

E) it is cut in half

9) What happens to the force between two charges if the magnitude of both charges is doubled and the distance between them is cut in half?

A) it also quadruples

B) it increases 16 times

C) it decreases by a factor of 4

D) it decreases 16 times

E) it is cut in half

10) Two balloons are charged with an identical quantity and type of charge: -6.25 x 10-9C. They are held apart at a separation distance of 0.617 m.

A) Determine the magnitude of the electrical force between them

B) Also, state whether the force is repulsive or attractive.

11) Two balloons with charges of 3.37 x 10-6 C and -8.21 x 10-6C are brought within 2 m of each other.

A) Determine the magnitude of the electrical force between them

B) Also, state whether the force is repulsive or attractive.

12) A balloon with a charge of 4.0 x 10-6 C is held a distance of 0.70 m from a second balloon having the same charge.

A) Calculate the magnitude of the electric force

B) Is the force an attractive force or a repulsive force?

13) A) Determine the electrical force of between two balloons with separate charges of 3.5 x 10-8C and -2.9 x 10-8C when separated a distance of 0.65 m. B) Is the force attractive or repulsive?

(For each choice – including the one in the question, write the answer & circle the correct choice.)