Question

what is the value of electric field inside cavity

Answer 1

hey dear..
your answer is 0
hope this helps you

Answer 2

E =0 everywhere inside a conductor. The simple explanation for this is that, if (E not equal to zero) somewhere inside a conductor, then any charge present there would move in response to the field, and rearrange itself until the field was zero. We can see how this works by considering what happens if a conductor is placed in an external electric field. The field will act on the charge inside the conductor, and the charge will move. Eventually this charge will hit a boundary of the conductor and be forced to stop. This motion of the charge will generate its own electric field, which will continue to adjust itself until the net field (external + induced) inside the conductor is zero, and the charge stops moving. It does not depend on size or shape of the conductor.