A bar magnet approach a coil.
係咪有induced current 先,跟住N/S pole?
跟住再用right hand grip rule搵到邊邊係N/S pole?
2007-03-26 18:59:48 · 2 個解答 · 發問者 2003 2 in 科學 ➔ 其他：科學
係阿,無錯阿,原因為係因為個magnetic flux change 之後有條式d(flux)/dt=electromagnetic force.,所以咪有current流動lo
預科野黎架
2007-03-26 19:23:44 · answer #1 · answered by Chris 3 · 0⤊ 0⤋
S magnet N ---->............. (0)))))...coil ...))))
.........S magnet N ....----> (0)))))...coil ...)))) <------[N oppose field S]
.............S magnet N ----> (0)))))...coil ...)))) <------[N oppose field S] increases
put your right hand thumb towards the direction of N from oposing field, you then can see the induced current (other fingers direction) ....
先有induced emf, 再有current
2007-03-26 21:27:34 · answer #2 · answered by backright 5 · 0⤊ 0⤋