A thin spherical shell made of plastic carries a uniformly distributed negative

Question

A thin spherical shell made of plastic carries a uniformly distributed negative charge -7e-10 coulombs (indicated as -Q1 in the diagram). Two large thin disks made of glass carry uniformly distributed positive and negative charges 1.5e-05 coulombs and -1.5e-05 coulombs (indicated as +Q2 and -Q2 in the figure). The radius R1 of the plastic spherical shell is 7 mm, and the radius R2 of the glass disks is 4 meters. The distance d from the center of the spherical shell to the positive disk is 19 mm.

Explanation / Answer

1. Use Gauss'Theoremand spherical gaussian surfaces centered on the sphere

2. " ...Point 2 is just below the sphere, and point 3 is right beside the positive glass disk...": below and just to right are meaningless. They are useless aslocation references: you haven't given any information on the relative location of the sphere and the disks.

Use Gauss' Theorem again and see what charge is enclosed. I can't tell from your description.

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