Problem: A point charge 4q &gt; 0 is placed at the center point  O. There is a thick conducting spherical shell with inner radius R2 and outer radius R '2 centered at O. The thickness of this shell is R '2 − R2. Another larger thin concentric spherical shell has radius R3. The thickness of this shell is negligible. The thick shell is charged with a charge 3q and the large thin shell is charged with a charge 9q.

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Problem Details

A point charge 4q > 0 is placed at the center point  O. There is a thick conducting spherical shell with inner radius R2 and outer radius '2 centered at O. The thickness of this shell is R '2R2. Another larger thin concentric spherical shell has radius R3. The thickness of this shell is negligible. The thick shell is charged with a charge 3q and the large thin shell is charged with a charge 9q.