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Magnetics question

2020 · 6 Sep · Shift 2 · Q43
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Magnetics question

2020 · 6 Sep · Shift 2 · Q43

JEE MainPhysicsMagneticsMCQ+4 / −1
A square loop of side 2 aaa and carrying current I is kept in xz plane with its centre at origin. A long wire carrying the same current I is placed parallel to z-axis and passing through point (0, b, 0), (b >> a). The magnitude of torque on the loop about z-axis will be :
  1. A
    2μ0I2a2πb{{2{\mu _0}{I^2}{a^2}} \over {\pi b}}πb2μ0​I2a2​
  2. B
    2μ0I2a2bπ(a2+b2){{2{\mu _0}{I^2}{a^2}b} \over {\pi \left( {{a^2} + {b^2}} \right)}}π(a2+b2)2μ0​I2a2b​
  3. C
    μ0I2a2b2π(a2+b2){{{\mu _0}{I^2}{a^2}b} \over {2\pi \left( {{a^2} + {b^2}} \right)}}2π(a2+b2)μ0​I2a2b​
  4. D
    μ0I2a22πb{{{\mu _0}{I^2}{a^2}} \over {2\pi b}}2πbμ0​I2a2​
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