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An infinitely long current carrying wire and a small current carrying loop are in the plane of the paper as shown. The radius of the loop is a and distance of its centre from the wire is d (d >> a). If the loop applies a force F on the wire then : d

1. F ∝ 2 3 a d ⎛ ⎞ ⎜ ⎟ ⎝ ⎠
2. F ∝ a d ⎛ ⎞ ⎜ ⎟ ⎝ ⎠
3. F = 0
4. F ∝ 2 a d ⎛ ⎞ ⎜ ⎟ ⎝ ⎠

Correct answer: F ∝ 2 a d ⎛ ⎞ ⎜ ⎟ ⎝ ⎠

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