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Given $\overline{D}=2rz \cos^{2}\phi\space\hat{a_{r}}-rz\sin\phi\cos\phi\space\hat{a_{\phi}}+r^{2}\cos^{2}\phi\space\hat{a_{z}}$.

Calculate electric flux through the following surfaces.

(i) r=3 ,0 ≤ z ≤5 and

(ii) z=0 ,0 ≤ r ≤3 .

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