Torque on Current LoopEasyQuestion 20166
Question
Torque on a rectangular current loop of area A, carrying current I, in field B at angle θ to its plane is:
- ANIABsinθCorrect
- BNIABcosθ
- CNIAB
- DIABsinθ for N=1
Correct answer
NIABsinθ
Explanation
τ = NIA B sinθ where θ is the angle between the plane of the loop and B. (Equivalently τ = NIAB cosφ where φ is the angle between the magnetic moment and B.)