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Could some one please help me to solve the following questions? I do not understand this topic so well.. thank

you very much

1)Two particles are 15 meters apart. Particle A has a charge of 6.0 • 10-4 C, and particle B has a charge of 5.0 • 10-4 C. The resulting Coulomb force is 12 N. At the same distance, what combination of charges would yield the same Coulomb force? 

A. Particle A: 8.0 • 10-4 C, and particle B: 3.0 • 10-4 C

B. Particle A: 12.0 • 10-4 C, and particle B: 2.5 • 10-4 C

C. Particle A: 9.0 • 10-4 C, and particle B: 8.0 • 10-4 C

D. Particle A: 9.0 • 10-4 C, and particle B: 3.0 • 10-4 C

2)While taking his clothes out of the dryer, Charles finds a sock clinging to his sweater. What is the best explanation for this common phenomenon?  

A. In the dryer, both the sock and the sweater lost electrons.

B. In the dryer, both the sock and the sweater gained electrons.

C. In the dryer, either the sock or the sweater gained electrons while the other item lost electrons.

D. The cause of static cling is an unsolved scientific mystery.

3)Two charged particles are separated by a distance of 12 meters. The Coulomb force between them is 20 N. What will the Coulomb force be if the same particles are separated by a distance of 6 meters?  

A. 80 N

B. 40 N

C. 10 N

D. 5 N

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