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On the middle one of three thin concentr...

On the middle one of three thin concentric spherical metal shells of radius R there is electric charge of magnitude Q. The inner spherical shell of radius R/2 and the outer spherical shell of radius 3R/2 are earthed. (a) What is the amount of the electric charge on the earthed spherical shells? (b) Plot the electric field strength versus the distance from the center.

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(a) `(-Q)/(4),` (b) `(-3Q)/(4)`
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