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 \[d\left( d>>a \right)\]. If the loop applies a force F on the wire then: [JEE Main 09-Jan-2019 Morning] |
A) \[F\propto \left( \frac{{{a}^{2}}}{{{d}^{3}}} \right)\]
B) \[F\propto \left( \frac{a}{d} \right)\]
C) \[F\,\,=\,\,0\]
D) \[F\propto {{\left( \frac{a}{d} \right)}^{2}}\]
Correct Answer: D
Solution :
[d] |
work done by magnetic force = fdx |
dx |
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