The magnetic field of moving charge I=ngvs ⊕ ⊕v④ Idl dB=。ldlx Anr2 dN nSdl dB=4。ngdls vxp dB=4。an qvx分 4r2 4π2
The magnetic field of moving charge Idl + + + + + v + I S 2 4 ˆ r Idl r dB o 2 4 ˆ r nqdlS v r dB o 2 4 ˆ r dN qv r dB o I nqvs dN nSdl
B= 4。q× 4π The magnetic force and conservation of momentum ql 2 B1
2 ˆ 4 r qv r B o The magnetic force and conservation of momentum B1 + v q1 + F12
The application of Biot-Savart Law B due to Current in a straight wire a dx dB=to ldx sin 0 3 4π
The application of Biot-Savart Law B due to Current in a straight wire 2 o 1 P a dx x I 2 sin 4 r Idx dB o