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Magnetics question

2020 · 5 Sep · Shift 1 · Q55
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  5. /2020 · 5 Sep · Shift 1 · Q55

Magnetics question

2020 · 5 Sep · Shift 1 · Q55

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 the z-axis and passing through the point (0, b, 0), (b >> a). The magnitude of the torque on the loop about zaxis is given by :
  1. A
    2μ0I2a2πb{{2{\mu _0}{I^2}{a^2}} \over {\pi b}}πb2μ0​I2a2​
  2. B
    μ0I2a22πb{{{\mu _0}{I^2}{a^2}} \over {2\pi b}}2πbμ0​I2a2​
  3. C
    μ0I2a32πb2{{{\mu _0}{I^2}{a^3}} \over {2\pi {b^2}}}2πb2μ0​I2a3​
  4. D
    2μ0I2a3πb2{{2{\mu _0}{I^2}{a^3}} \over {\pi {b^2}}}πb22μ0​I2a3​
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