When two point charges are a distance d apart, the electric force that each one feels from the other has magnitude f. in order to make this force twice as strong, the distance would have to be changed

To solve this problem we will apply the concepts related to Coulomb's Law, for which electromagnetic force is defined as

k = Coulomb's Constant

= Magnitudes of the charges

r = Distance between the charges

From this equation and considering that the charges are constant, then we would have that the Force is inversely proportional to the distance of the bodies, that is,

If we then make the comparison between two Forces that proportion would become

We are looking for make this force twice as strong, then

Rearranging to find the final distance

As r = d,

Therefore the distance would have to be changed to

im guessing the west of station b

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force