Question

A point charge A of charge 4c and another point charge B of charge - 1c are placed in air at a distance of 1m apart. Find distance of the point on the line joining the charges and from B, where the resultant electric field is zero.

Answer 1

Answer:

let distance from b is x , so from a is 1-x

kq*(-1)/x^2 + kq*4/(1-x)^2 = 0

1-x = -2x

x = -1

- sign means this is not between them , but away from one

so answer is 1m away from A

Answer 2

Explanation:

refer the above image

simplify further by quad equation splitting the middle term

hope u get it