Simple electrostatic problem

[ratn_kumbh]

Some teacher told me this If we have hollow sphere (of conducting material) with some thickness. and if we place a +ve charge inside that . -ve charge induces on inner surfuce, Which further causes in outer sphere & that becomes positivly charged. is this right? Please give right explanation.

[chaoseverlasting]

Yeah. Thats right. The positive charge on the inside attracts the electrons present inside the sphere, which causes the inner surface to be negatively charged. Since charge must be conserved, the positive charge centers in the conductor are pushed to the surface. Hence the inner surface is negatively charged and the outside surface is positively charged.