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

Asked in JEE Main 2005 · Force between parallel currents

• (1) attract each other with a force of (μ₀i²)/((2π d²))
• (2) repel each other with a force of (μ₀i²)/((2π d²))
• (3) attract each other with a force of (μ₀i²)/((2π d))
• (4) repel each other with a force of (μ₀i²)/((2π d))

Step-by-step solution

Why the other options are wrong

• (1) Uses an inverse-square law (d²) for a line current.
• (2) Uses d² and thinks like currents repel.
• (4) Thinks like currents repel.

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