A line charge of 2n c/m lies along y-axis while surface charge densities of $0.1\times 10^{-9}$ $c/m^{2}$ and $-0.1\times 10^{-9}$ $c/m^{2}$ exist on the plane z=3 and z=-4m respectively.

(i) Find E at the point (1,-7, 2)

(ii) Find coordinates of the point at which E is negative of the value in 1.

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