Answer to Question #234976 in Physics for Soriano

Question

Charge objects are suspended in a hollow metal object by supports which are made of electrical insulator. The metal object has charge +q distributed over its outer surface and charge - 2q distributed in its inner surface.

How much charge is suspended in the cavity?

What is the charge of the object{what is the electric field at a large distance to from the centrevif the object)?

Express in terms of q

Answer 1

The charge on the inner surface of the shell is induced by the charges inside the shell so that the resultant field is zero, therefore, the charge of the objects inside the cavity is +2q.

The electric field at a large distance to from the centre of the object is zero.