1. In the question above, if the 10-N block is changed to an 80-N block, how does the location of the 40-N block change?

They are inversely proportional to the square of the distance.

Explanation:

The electrical or electrostatic force between two charged particles is given by :

......(1)

Where

are charged particles

r is the distance between them

The gravitational force between two masses is given by :

......(2)

Where

G is the universal constant

are masses of objects

r is the distance between the masses

Hence, from equation (1) and (2) it is clear that both gravitational and electrical forces are inversely proportional to the square of distance between them. Hence, the correct option is (B).