Net force acting on wire AB & CD are zero
τ=F1cosθ×2a=2πμ0a2+b2i2(2a)×a2+b2b×2a
τ=π(a2+b2)2μ0.i2a2b
JEE Main 2020 — Physics Electromagnetism
A square loop of side 2a 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 :
Held on 6 Sept 2020 · Verified 6 Jul 2026.
πb2μ0I2a2
π(a2+b2)2μ0I2a2b
2π(a2+b2)μ0I2a2b
2πbμ0I2a2
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