An arrangement of three parallel straight wires placed
perpendicular to plane of paper carrying same current 'I
along the same direction is shown in fig. Magnitude of force
per unit length on the middle wire 'B' is given by [2017]
(a) 2μ₀i²/πd
(b) √2μ₀i²/πd
(c) μ₀i²/√2πd
(d) μ₀i²/2πd
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