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Careful measurement of the electric fiel...

Careful measurement of the electric field at the surface of a black box indicates that the net outward flux through the surface of the (a) what ist the net charge inside the box (b) if the net outward flux through the surface of the box wre zero could you conclude that there were no charges inside the box why or why not

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zero the number of lines entering the cube is the same as the number of lines leaving the cube
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