Chapter 2443P24.56The sphere with large charge creates a strong field to polarize the other sphere. That means itpushes the excess charge over to the far side, leaving charge of the opposite sign on the near side.This patch of opposite charge is smaller in amount but located in a stronger external field, so it canfeel a force of attraction that is larger than the repelling force felt by the larger charge in the weakerfield on the other side.P24.57(a)EA⋅==∈zdErq420πejinFor ra<,qrin=FHGIKJρπ433soEr=∈ρ30.For arb<<and cr<,qQin=.SoEQr=∈420.FIG. P24.57For brc≤≤,E=0 , since E=0inside a conductor.(b)Let q1=induced charge on the inner surface of the hollow sphere. Since E=0 inside theconductor, the total charge enclosed by a spherical surface of radius must be zero.Therefore,10+=andσππ112244==−qbQb.Let q2=induced charge on the outside surface of the hollow sphere. Since the hollow
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