F s B = Ã I
F s B = Ã I
F s B = Ã I
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dvm edt = v × B 2v m evBr =v0eBω0= =r mmv r =eBr =mveB6.3 6.61 2mB =34πzqmB = 1 az >> a22224πrµ0Iaµ0Ia1 2µ 0IπaBz ()=≅ =2 2z + a3 33222z4πzc h s z z>>sLB q mqm s s qsmm=Om = µ0IS1 1−LFIz − s z + s z z z z zNMQP ≅ HG + K J F I− −NM HG K JO1 144 QP = 24= 1 22 2 2 3 3π π π 4πe 2j e 2jS = πa2 m=qms m=qms