Question -
Answer -
(a) Net outward flux throughthe surface of the box, Φ = 8.0× 103 N m2/C
For a body containing netcharge q, flux is given by therelation,
∈0 = Permittivity offree space
= 8.854 × 10−12 N−1C2 m−2
q = ∈0Φ
= 8.854 × 10−12 × 8.0 × 103
= 7.08 × 10−8
= 0.07 μC
Therefore, the net chargeinside the box is 0.07 μC.
(b) No
Net flux piercing outthrough a body depends on the net charge contained in the body. If net flux iszero, then it can be inferred that net charge inside the body is zero. The bodymay have equal amount of positive and negative charges.