Magnetic field due to currentMedium

Question

Two large conducting current planes perpendicular to x-axis are placed at (d, 0) and (2d, 0) as shown in figure. Current per unit width in both the planes is same and current is flowing in the outward direction. The variation of magnetic induction as function of ′x′ (0 < x < 3d) is best represented by -
                                                    

Options

A.
B.
C.
D.

Solution

add up is the left and the right zone . But in the middle zone becomes zero

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