Question -
Answer -
(a) Electric field on one side of a charged body is E1 andelectric field on the other side of the same body is E2.If infinite plane charged body has a uniform thickness, then electric field dueto one surface of the charged body is given by,
Where,
= Unit vector normal to the surface at a point
σ = Surface charge density at that point
Electric field due to the other surface of the chargedbody,
Electric field at any point due to the two surfaces,
Since inside a closedconductor, 
= 0,
∴
Therefore, the electricfield just outside the conductor is 
(b) When a charged particle is moved from one point to theother on a closed loop, the work done by the electrostatic field is zero.Hence, the tangential component of electrostatic field is continuous from oneside of a charged surface to the other.