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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' left parenthesis 0 less or equal than x less or equal than 3 d right parenthesisis best represented by–

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The correct answer is:

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