If s is the charge per unit area on the surface of a conductor, then the electric field intensity at a point on the surface is a) left( frac{sigma }{{{varepsilon }_{0}}} ight) normal to surface b) left( frac{sigma }{2{{varepsilon }_{0}}} ight) normal to surface c) left( frac{sigma }{{{varepsilon }_{0}}} ight) tangential to surface d) left( frac{sigma }{2{{varepsilon }_{0}}} ight) tangential to surface
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