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A wire AB is carrying a steady current of 10A and is lying on the table. Another wire CD carrying 6A is held directly above AB at a height of 2mm. Find the mass per unit length of the wire CD so that it remains suspended at its position when left free. Give the direction of the current flowing in CD with respect to that in AB. [Take the value of g = 10ms–2

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In stable equilibrium

Current in both wires should be opposite, so both conductors repel each other.

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