Question

When two point charges are a distance d part, 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

A) √2d
B) d/√2
C) d/4
D) 2d
E) d/2

Answer 1

Answer:b

Step-by-step explanation:

Given

Force of attraction is F when charges are d distance apart.

Electrostatic force is given by

`F=(kq_1q_2)/(d^2)---1`

where k=constant

`q_1` and
`q_2` are charges

d=distance between them

In order to double the force i.e. 2F

`2F=(kq_1q_2)/(d'^2)----2`

divide 1 and 2 we get

`(F)/(2F)=(d'^2)/(d^2)`

`d'=(d)/(√(2))`