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The figure below shows a charged conducting sphere with charge $Q_1=+3 C$ at the center of conducting spherical shell with total charge $Q_2=-2 C$.
Created for Albert.io. Copyright 2016. All rights reserved.
What is the charge on the inner wall and outer surface of the conducing spherical shell?
Inner wall: +3 COuter surface: -2 C
Inner wall: -3COuter surface: +2C
Inner wall: -3 COuter surface: +1 C
Inner wall: +2 COuter surface: -1 C