Discussion
A charge of 4 nC sits at the centre of a cube of side 2 m. Doubling the side of the cube changes the flux to
Answer: D
Correct answer: 4 nC, unchanged
The flux depends only on the enclosed charge, and doubling the cube changes neither the charge nor its enclosure. The flux density on the faces falls, since the same flux is spread over four times the area, but the total is fixed at 4 nC.
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