A cube of a mutal is given a penitive chnrge cl. For the ahesve system, which of the followimg s...

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A cube of a mutal is given a penitive chnrge cl. For the ahesve system, which of the followimg staterments is true?
(A) Elcelric polential at the surfice of the cebe is zero.
(B) Electric potential within the cube is zero.
(C) Electric field is ncorтnal to the surface of the cube.
(D) Flectric field varies within the cube.
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