The intensity of an electric field depends on the coordinates x and y as follows $\;\overrightarrow{E}=\large\frac{a\;(x \hat{i} + y \hat{j})}{x^2+y^2}\;$ where a is constants. Find the charge within a sphere of radius R with the centre at the origin

Question

$(a)\;8 \pi \in_{0} a R \qquad(b)\;4 \pi \in_{0} a R \qquad(c)\;2 \pi \in_{0} a R \qquad(d)\; \pi \in_{0} a R$