Question

the force between two charges 4c and _2C which are separated by a distance of 3 km is​

Answer 1

Explanation:

Let potential is zero at a distance x from 4μc 

⇒xk(4)+(1−x)k(−2)=0

⇒x4=(1−x)2

⇒2−2x=x

⇒2=3x

⇒x=32

∴ from the distance is 1−32=31

potential is zero at 31m from −2μc.