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In high school level text books(Resnick Walker), they have applied loop rule.

In Griffith, he says [tex]\epsilon[/tex] = -L di/dt = Q/C

In MIT OCW , walter lewin says [tex]\int[/tex] E.dl = -Ldi/dt = Q/C

I think last two are the same but still can someone clear this.I mean going by what griffith says(hes the best) can someone tell me why is [tex]\epsilon[/tex] = -L di/dt . I know [tex]\epsilon[/tex] = [tex]\int[/tex]f.dl . How can I arrive using [tex]\int[/tex]f.dl that the [tex]\epsilon[/tex] in the circuit is -Ldi/dt. This thing has been bugging me a lot, plz reply.

[tex]\epsilon[/tex] = EMF and [tex]\int[/tex] = closed loop integral.