Question

A conductor with an inner cavity, like that shown in Fig.22.23c from the textbook, carries a total charge of +6.00 nC . The charge within the cavity, insulated from the conductor, is -7.30 nC .

How much charge is on the inner surface of the conductor?   

How much charge is on the outer surface of the conductor?

Answer 1

Charge resides only on the outer surface of a charged

conductor.

A conductor with an inner cavity, carries a total charge Q =

6.00 nC

The charge within the cavity, insulated from the conductor = q =

- 7.30nC .

The charge within the cavity, insulated from the conductor ,

induces equal but opposite charge on the inner surface of outer

charged conductor.

Induced charge on the inner surface of outer charged

conductor.=qi= 7.30nC

a)= 7.30nC charge is on the inner surface of the conductor

_____________________________________

The charge within the cavity, insulated from the conductor ,

induces equal charge on the outer surface of charged conductor.

Induced charge on the outer surface of charged conductor.=qii=

-7.30nC

Total charge on outer surface of conductor=Q qii = 6.00 -7.30

= - 1.3nC

b) -1.3nC charge is on the outer surface of the conductor