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Q.

A long wire AB is placed on a table. Another wire PQ of mass 1.0 g and length 50 cm is set to slide on two rails PS and QR. A current of 50A is passed through the wires. At what distance above AB, will the wire PQ be in equilibrium

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a

25 mm

b

50 mm

c

75 mm

d

100 mm

answer is A.

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Detailed Solution

Suppose in equilibrium wire PQ lies at a distance r above the wire ABHence in equilibrium ⇒10-3×10=10-7×2×502r×0.5r = 25 mm

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