9 法拉第电磁感应定律 4感应电动势乓计算 ={Bd5=5Bc0s=0(B,s,) ao aB, ao as a9 88 ab at as at a8 at S (a)S、q= constant &=_dB aB aB at 2+1y+0 B、q= constant a= as at W (c)B、S= constant &s00 a8 at 2021/2/52021/2/5 9 4 感应电动势i 计算 v S N (a) B  v  (b) w i N S (c) dt d  = − =   =  = s s  B ds Bcosds (B,s, )   [ ] t t s t s B B     +     +     = −       t B B     = −   t s s     = −   t    = −     S、q = constant B、q = constant B、S = constant 法拉第电磁感应定律