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

a. 2d
b. sqrt 2 times d
c. d/4
d. d/2
e. d/sqrt 2

Question

When two point charges are a distance  part, the electric force that each one feels from the other has magnitude . In order to make this force twice as strong, the distance would have to be changed to

a. 2d
b. sqrt 2 times d
c. d/4
d. d/2
e. d/sqrt 2

anonymous · Answer

well i think distance should be halved . . .

anonymous · Answer

why halved? can you explain it to me? XD

anonymous · Answer

in my book it says the answer is letter e.

anonymous · Answer

$$E=kq/r ^{2}$$
sorry it should be 
$$d/\sqrt{2}$$

anonymous · Answer

sorry i answered abruptly at first this is equation so it should be e

anonymous · Answer

ahh. so it was derived from that equation. it seems pretty clear now. thanks @theyatin! :)