- #1

Himanshu Singh

- 30

- 3

## Homework Statement

Two charges, one of 3.2 x 10 ^ -9 C, the other one of -6.4x10^-9 C are 42 cm apart. Calculate the net electric field at point P, 15 cm from the postie charge, on the line connecting the charges

(+) -------------(Point)---------------------- (-)

15cm 27cm

## Homework Equations

e = kq1/r1^2

## The Attempt at a Solution

I know the correct answer, and the steps involved as well (answer is 1.3 x 10^3 N/C to the right) but I don't get why they do it the way they do it. Can't you just use e = kq1/r1^2 with q being 3.2 x 10 ^ -9 C and d being 0.42m and then subtract that from kq1/r1^2 with q being 3.2 x 10 ^ -9 C and d being 0.27m? I always get the wrong answer with it.