Question

Two point charges +20 C and+80 C respectively are placed 24 cm apart. Find the position of a point where electric field is zero.

Answer 1

Answer:

obviously the point will be in middle as on wither side field direction will be similar and can never be zero.

so let the poitn be at x from 20 C

then k 20 / x^2 = k 80 / (r-x)^2

it means r-x / x = 2

it means x = r/3 hence

24/3 = 8m from 20 c.