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JEE Main2005PhysicsMagnetic Effects of CurrentActual

Two thin, long parallel wires separated by a distance 'd' carry a current of 'i' A in the same direction. They will

Options

  1. Aattract each other with a force of ₀ i^2 /(2 d )
  2. Brepel each other with a force of ₀ i^2 /(2 d )
  3. Cattract each other with a force of ₀ i ^2 (2 d ^2 )
  4. Drepel each other with a force of ₀ i ^2 /(2 d ^2 )

Correct answer

A. attract each other with a force of ₀ i^2 /(2 d )

Step-by-step solution

Using the definition of force per unit length due to two long parallel wires carrying currents.

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