Question

When is an electric field due to infinite plate sigma/2*epsilon and when sigma/epsilon?

Answer 1

In case the plates are conducting,E=sigma/epsilon and if they are non-conducting,it is sigma/2epsilon.

Remember,when nothing is mentioned,use first condition.

Answer 2

Answer:

Electric field due to infinite plate is sigma/2*epsilon when we calculate the electric field for only one plate.

When we calculate the electric field for combination of plates then at the outleft and outright region the electric field is sigma/epsilon.