A solid metallic sphere has a charge + 3Q. concentric with this sphere is a cond

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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. (b > a). What is the electric field at a distance R (a < R < b) from the centre.

Answer: Option C
:
C
We only need to consider the E contribution due to sphere.
Shell gives zero contribution to E at any point inside it.
Use direct formula.

E = \frac{1}{4 π ϵ_{0}} \frac{3 Q}{R^{2}}

E = \frac{3 Q}{4 π ϵ_{0} R^{2}}

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