The article deduces emf from varying magnetic field and motional emf in a general case further researches induced electric field and presents two important formulae of induced electric field.

• 摘要本文推导出在一般情况下的感生电动势和动生电动势公式，并在此基础上，对感生电场进行了进一步的研究，给出了求解感生电场的两个重要公式。