Q 1.17 (a) Careful measurement of the electric field at the surface of a black box indicates that the net outward flux through the surface of the box is . (a) What is the net charge inside the box?
Using Gauss’s law, we know that the flux of electric field through any closed surface S is times the total charge enclosed by S.
where, q = net charge enclosed and = permittivity of free space (constant)
This is the net charge inside the box.