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图12004年度第21届全国中学生物理竞赛复赛试卷的第五题为:“如图1所示,接地的空心导体球壳内半径为R,在空腔内一直径上的P1和P2处,放置电量分别为q1和q2的点电荷,q1=q2=q,两点电荷到球心的距离均为a.由静电感应与静电屏蔽可知:导体空腔内表面将出现感应电荷分布,感应电荷电量
Fig. 1 The fifth question of the 2004 21st National Junior High School Physics Competition Rematch Examination Paper is: "As shown in Fig. 1, the inner radius of the grounded hollow conductor ball shell is R, which is placed at P1 and P2 on a diameter inside the cavity. The charge is the point charge of q1 and q2 respectively, q1=q2=q, and the distance between the two charges to the center of the sphere is a. It can be known from electrostatic induction and electrostatic shielding that the induced charge distribution will appear on the inner surface of the conductor cavity and the induced charge quantity