Which of the following statements is physically possible? Could somebody please

Question

Which of the following statements is physically possible?

Could somebody please explain thoroughly the why of it ?

A) At a particular point in space the electric field vector crosses an equipotential surface at a 20 B) You measure the voltage at different locations on the metal case of a desktop PC and find that it C) The electric field points in the direction away from a 10V equipotential surface and directly D) The potential energy of an electron is found to decrease when it moves from point A where the E) None of the above statements are possible. degree angle measured relative to the surface. is the same value everywhere on the case. towards the adjacent 15V equipotential surface. voltage is 100V to point B where the voltage is 70V.

Explanation / Answer

a) electric field is always perpandicular to equipotential surface

b) every metallic surface has same potential as no field inside metal

c) field always travel from high potential to lower potential

d) change in energy = q(dV) = -e x (-30) = 30e = increase in energy

SO, only B) is possible

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