106hint use superposition principle
http://targetiit.com/iit-jee-forum/posts/easy-iit-07-4128.html
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in a uniform sphere of charge density P ,a small cavity is created.the center of the cavity is at a distance "a" from the center of the sphere. taking center of the sphere as origin and a^ as a unit vector along the line joining the center of the cavity and origin , find the electic fielld at any point inside the cavity???
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2 Answers
1061i saw the derivation soln of the problem but, when there is cavity the charge inclosed is zero, then how does the electric field come into the picture