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Option 3 : Static field intensity at the surface of conductor is directly normal to the surface
Under the static condition, the electric field inside the solid perfect conductor is zero in electrostatic equilibrium even if:
- it is isolated
- it is charged
- it is present in the external electrostatic field
Now, it is known that a perfect solid conductor is an equipotential body. The potential inside the conductor is the same as the potential at the surface
Since the surface of the solid conductor is an equipotential surface hence the electric field will be perpendicular or in other words normal to the perfectly solid conductor surface.
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