NEET 2026 Physics question
Two infinitely long parallel conducting wires and carry currents and , respectively, in the same direction. The wire has uniform mass per unit length and lies on an insulated floor. The wire is kept fixed at a height above the floor. The minimum magnitude of so that the wire does not rise from the floor is: [ is the acceleration due to gravity and is the permeability of free space.]
Answer: (2)
Solution
Parallel currents in the same direction attract, so (above) pulls upward with force per unit length . stays on the floor if this does not exceed its weight per unit
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