A.60 percent or 9 out of 15 B. 40 percent or 6 out of 15
Answer:

Step-by-step explanation:
According to coulombs law "the force of attraction or repulsion between two charges Q1 and Q2 in a given medium is directly proportional to the product of their charges and inversely proportional to the square of the distance separating them"

where
k = constant of proportionality (
)
Answer:
2.25
Step-by-step explanation:
1.5 x 1.5 = 2.25