ElectrostaticsHard
Question
A solid metallic sphere has a charge +3Q. Concentric with this sphere is a conducting spherical shell having charge −Q. The radius of the sphere is a and that of the spherical shell is b(>a). What is the electric field at a distance r(a < r < b) from the centre?
Options
A.

B.

C.

D.

Solution
Electric field at given location is only due to inner solid metalic sphere.
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