Is the electric field inside a cavity (with no charge) , zero, even if the shell is not spherical, but has any irregular shape ? Explain.

Explanation

Electric field intensity inside a cavity with no charge is zero , even when the shell has

any irregular shape. If we were to take a closed loop part of which is inside the cavity along a field line and the rest outside it then network done by the field in carrying a rest charge over the closed loop will not be zero. This is impossible for an electrostatic field. Hence electric field intensity inside a cavity with no charge is always zero.