在電場中,推動(dòng)帶電質(zhì)點(diǎn)運(yùn)動(dòng)的力(F)等于質(zhì)點(diǎn)所帶凈電荷量(Q)與電場強(qiáng)度(E)的乘積:F=QE(4-1)質(zhì)點(diǎn)的前移同樣要受到阻力(F)的影響,對(duì)于一個(gè)球形質(zhì)點(diǎn),服從Stoke定律,即:F′=6πrηv(4-2)式中:r為質(zhì)點(diǎn)半徑,η為介質(zhì)黏度,v為質(zhì)點(diǎn)移動(dòng)速度,當(dāng)質(zhì)點(diǎn) (共 1517 字) [閱讀本文] >>