lecture16

# lecture16 - Physics 2102 Gabriela Gonzlez L L Note If wire...

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1 Physics 2102 Gabriela González L L Note: If wire is not straight, compute force on differential elements and integrate:

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2 By symmetry, F 2 will only have a vertical component, Notice that the force is the same as that for a straight wire, L L R R and this would be true no matter what the shape of the central segment!. Wire with current i. Magnetic field out of page. What is net force on wire? Torque on a current loop: Principle behind electric motors. Net force on current loop = 0 For a coil with N turns, τ = N I A B sin θ , where A is the area of coil Rectangular coil: a x b, current = i But: Net torque is NOT zero!
N=number of turns in coil A=area of coil. We just showed: τ = NiABsin θ Right hand rule: curl fingers in direction of current; thumb points along μ Define: magnetic dipole moment μ As in the case of electric dipoles, magnetic dipoles tend to align with the magnetic field (where potential energy is a minimum). -Q

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lecture16 - Physics 2102 Gabriela Gonzlez L L Note If wire...

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