1、NSABINSSNNSIFINSNS运动电荷运动电荷(电流电流)运动电荷运动电荷(电流电流)磁铁磁铁磁铁磁铁电流电流电流电流v-为该点处的磁场方向为该点处的磁场方向sinqvFmsinqvFBm-磁感应强磁感应强度的大小度的大小qvFBmaxBBl通过某面积的磁通量的定义通过某面积的磁通量的定义:smsdB国际单位制:国际单位制:韦伯韦伯2m1T1WbBqvFmsinBvqFmv/vvBmFLFmeFFF)(BvEqv Bv/BvqROvqvBF qBmvRRvm2BvRT2qBm2vBcos/vv sinvv Bv/vvqBmvRTvh/qBmv/2B/vvvhl带电粒子也要做螺旋运动,但半
2、径带电粒子也要做螺旋运动,但半径和螺距都要不断地变化。和螺距都要不断地变化。qB非匀强磁场对运动的非匀强磁场对运动的带电粒子的作用力带电粒子的作用力磁瓶磁瓶IbdBV12dIBRUHH 12VIBvvLFeF BveFLHEHeEeF0HEeBveBvEH21UUUH21l dEH21)(l dBv21vBdlvBbnevbdI dIBneUH1neRH1IB12VHE12VIBvLFeFHE 21UUUH21)(l dBv21vBdlvBbdIBnqUH1nqRH1lIdIvSn B一、一、lvdvdlnSdldN BveFLnSdlBveFd)(BlenSvdBlIdFdLFdFenSvI
3、 LBlId0 xyABIRxFdyFdFdlIdlIdIBdldF 0 xyABIRLydFFLdFsinLIBdlsin0sin dIBRIBR2jIBRF2dlIdBlIdFdxyABIFdyFdxFdlIdBcosdFdFxsindFsinIBdlIBdysindFdFyIBdxjIBLFlxxdFFlyydFFBAyydyIB0BAxxdxIBIBLABI0Rabcdl l Iyx0dadcbcabFFFFaddaBlIdF0Rabcdl l IyxadjdlIBjRlIB)2(dadcbcabFFFFjRlIB)2(l解:解:l如图在导线上取如图在导线上取电流元,其受磁电流元,其受磁力力ZIFdzFd/FdBlIdFdlzdFFldFsinRdlIB20sinsin2 RIBZIFdzFd/Fd