物理学 7-2电源电动势 第五版 8;=「E2·d+「Edl,E·dl=0 外 内 外 电源电动势 The EMF0e=4Ek·d=Ed the power source 电源电动势大小等于将单位正电荷从负极经电源 内部移至正极时非静电力所作的功 The emf ofthe power source is in value equal to the work by non-electrostatic force that transfers per unit positive charge from the negative electrode to the positive electrode inside the power source 第七章恒定磁场 4/6第七章 恒定磁场 物理学 第五版 7-2 电源 电动势 4/6 d d  i k k =  +  E l E l   外 内 d 0 E l k  =  外 电源电动势大小等于将单位正电荷从负极经电源 内部移至正极时非静电力所作的功. d d i k k l  =  =  E l E l  内 电源电动势 The EMF of the power source The EMF of the power source is in value equal to the work by non-electrostatic force that transfers per unit positive charge from the negative electrode to the positive electrode inside the power source