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# A spherical conducting shell of inner radius $R_1$ and other radius $R_2$ has a charge $Q$. A charge q is the placed at the centre of the shell.Write the expression for the electric field at a point $X > R_2$ from the centre of the shell.

=>$\large\frac{1}{4 \pi \in_0} \frac{(q+Q)}{x^2}$