Infinite sheet A carries a positive uniform charge density , and sheet B, which is to the

Infinite sheet A carries a positive uniform charge density σ, and sheet B, which is to the right of A and parallel to it, carries a uniform negative charge density -2σ.
(a) Sketch the electric field lines for this pair of sheets. Include the region between the sheets as well as the regions to the left of A and to the right of B.
(b) Repeat part (a) for the case in which sheet B carries a charge density of +2σ.