Careful measurement of the electric field at the surface of a blackbox indicates that the net outw

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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 8.0 × 103 Nm2/C. (a) What is the net charge inside the box?
(b) If the net outward flux through the surface of the box were zero,
could you conclude that there were no charges inside the box? Why
or Why not?
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