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A hollow cylindrical box of length 0.5m ...

A hollow cylindrical box of length 0.5m and area of cross-section `20cm^(2)` is placed in a three dimensional coordinate system as shown in the figure. The electric field in the region is given by `vec E = 20 x hat i`, where E is `NC^(-1)` and x is in meters, Find

(i) Net flux through the cylinder.
(ii) Charge enclosed in the cylinder.

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