A charge Q is uniformly distributed in a dielectric sphere of radius R (having dielectric constant unity). This dielectric sphere is enclosed by a concentric spherical shell of radius 2R and having uniformly distributed charge 2Q. Which of the following graph correctly represents variation of electric field with distance r from the common centre?

A charge Q is uniformly distributed in a dielectric sphere of radius R

1.	A charge Q is uniformly distributed in a dielectric sphere of radius R (having dielectric constant unity). This dielectric sphere is enclosed by a concentric spherical shell of radius 2R and having uniformly distributed charge 2Q. Which of the following graph correctly represents variation of electric field with distance r from the common centre?
Answer» Solution :Use Gauses theorem. Electric field inside uniformly DISTRIBUTED dielectric sphere `E=R`(For `0ltrleR`) Between the spheres `Eprop(Q)/(r^(2))`(For `Rltrle2R`) OUTSIDE the spheres `E=(3Q)/(r^(2))`(For `2Rltr`)

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