A hollow cylindrical box of length 1 m and area of cross-
section 25 cm2 is placed in a three dimensional coordinate

system as shown in the figure. The electric field in the
region is given by E =A x i, A =50 where all quantities in SI
units. Find (i) Net flux through the cylinder. and (ii) Charge
enclosed by the cylinder.
Ans: ɸ = 0.125Vm, Q = 1.1 x pC