Quiz15-2007-102 - a = iNA = iN.r 2 k Right hand rule gives...

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a) k r iN iNA ˆ . 2 π µ = = ρ Right hand rule gives the direction of the magnetic dipole moment: Digitals wrap the loop in the direction of the current, extended thumb is in the direction of the magnetic dipole moment. In this case, it is in z direction . b) Torque is the cross product of magnetic dipole moment and magnetic field. i iNB r B o ˆ . sin 2 θ π τ µ τ = × = ρ ρ ρ ρ Here, ϑ is the angle between the magnetic moment and the magnetic field. Since these are perpendicular to each other (because the moment is in z direction and the field is in y direction), sin ϑ is 1. Torque is in negative x axis direction.
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