MHT CET 2022 Physics question
Two long parallel wires separated by distance 'd' carry currents and in the same direction. They exert a force F on each other. Now the current in one of the wire is increased to three times and its direction is made opposite. The distance between the wires is doubled. The magnitude of force between them is
Answer: (B)
Solution
The force between two long parallel wires (per unit length) is . After the change, one current is (reversed direction only changes the force from attractive to repulsive, not its magnitude) and
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