$A$ solid metal sphere has a charge of $+3Q$. It is concentric with a conducting spherical shell having a charge of $-Q$. The radius of the sphere is $a$ and the radius of the shell is $b$ $(b > a)$. The electric field at a distance $R$ from the center $(a < R < b)$ is .......
- A$\frac{4Q}{2\pi \varepsilon_0 R^2}$
- B$\frac{3Q}{4\pi \varepsilon_0 R^2}$
- C$\frac{3Q}{2\pi \varepsilon_0 R^2}$
- D$\frac{Q}{2\pi \varepsilon_0 R}$
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