A conductor with an inner cavity carries a total charge of +4.60 nC. The charge within the cavity, insulated from the conductor, is -6.10 nC. How much charge is on the inner surface of the conductor?

A conductor with an inner cavity carries a total charge of +4.30nc. The charge within the cavity, insulated from the conductor, is-5.60nc .

1. How much charge is on the inner surface of the conductor?
I thought inner side should be zero?
2. How much charge is on the outer surface of the conductor?

I will rate soon as possible.
thanks alot!!

A conductor with an inner cavity carries a total charge of +4.30nc. The charge within the cavity, insulated from the conductor, is-5.60nc .

1. How much charge is on the inner surface of the conductor?
I thought inner side should be zero?
2. How much charge is on the outer surface of the conductor?

I will rate soon as possible.
thanks alot!!