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Magnetics question

2019 · 9 Jan · Shift 1 · Q55
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Magnetics question

2019 · 9 Jan · Shift 1 · Q55

JEE MainPhysicsMagneticsMCQ+4 / −1
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 a applies a force F on the wire then : JEE Main 2019 (Online) 9th January Morning Slot Physics - Magnetic Effect of Current Question 177 English
  1. A
    F=0F = 0F=0
  2. B
    F∝(ad)F \propto \left( {{a \over d}} \right)F∝(da​)
  3. C
    F∝(a2d3)F \propto \left( {{{{a^2}} \over {{d^3}}}} \right)F∝(d3a2​)
  4. D
    F∝(ad)2F \propto {\left( {{a \over d}} \right)^2}F∝(da​)2
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