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KCET2025PhysicsMagnetic Effects of Current

Two thin long parallel wires separated by a distance ' r ' from each other in vacuum carry a current of I ampere in opposite directions. Then, they will

Options

  1. AAttract each other with a force per unit length of ₀ I^2 2 r
  2. BRepel each other with a force per unit length of ₀ I^2 2 r
  3. CRepel each other with a force per unit length of ₀ I^2 2 r^2
  4. DAttract each other with a force per unit length of ₀ I^2 2 r^2

Correct answer

B. Repel each other with a force per unit length of ₀ I^2 2 r

Step-by-step solution

f = ₀ i , i ₂ t r If they carry opposite currently they repeat each other

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