Electrical Engineering ⇒ Topic : Series Opposing

Figure(a) shows the series-opposing connection i.e. the fluxes of the two coils oppose each other. Suppose the current is changing at the rate di/dt. The total induced e.m.f. in the circuit will be equal to sum of e.m.f.s induced in L₁ and L₂ minus the mutually induced e.m.f.s

        FIGURE  (A)

If L_T is the total inductance of the circuit, then,

Use + sign if fluxes are additive and ve sign if fluxes are subtractive

If the two coils are so positioned that *M = 0, then, L_T= L₁+ L₂