Which of the following statements is $NOT$ $TRUE$?
- AWork done to move a charge on an equipotential surface is not zero.
- BEquipotential surfaces are the surfaces where the potential is constant.
- CEquipotential surfaces for a uniform electric field are parallel and equidistant from each other.
- DElectric field is always perpendicular to an equipotential surface.
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In moving from $A$ to $B$ along an electric field line,the electric field does $6.4 \times 10^{-19} \, J$ of work on an electron. If $\phi_1$ and $\phi_2$ are equipotential surfaces,then the potential difference $(V_C - V_A)$ is.....$V$.
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$(1)$ $A$ single point charge
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$(1)$ $A$ single point charge
$(2)$ $A$ dipole (charges $+q$ and $-q$ at a small distance)
$(3)$ Two $+q$ charges at a small distance
$(4)$ $A$ uniform electric field.
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