Find the fluz f the electric field through a spherical surface of radius R due to a charge of `10^(-7) C ` at the centre and another equal charge at a point 2R away from the centre (figure ).

Explanation

Given: magnitude of the two charges
placed = `( 10^-7)C`
We know from Gauss's law that the flux
experience by the sphere is only by due
to internal charge and not by the external
one.
Now,
` E xx ds = (Q/epsilon_0) = (10^-7)/ 8.85 xx (10^+12)`
` = 1.1 xx (10^4) N-m/C.`