Calculate the value of equivalent inductance for series subtracting polarity of two coils whose self inductances are 14 H, 5 H, and mutual inductance value is 1 H.(a) 15 H(b) 17 H(c) 12 H(d) 10 HThis question was posed to me in a job interview.The doubt is from Regenerative Braking of DC Shunt Motors in chapter Braking of DC Motors & Induction Motors of Electric Drives

Calculate the value of equivalent inductance for series subtracting po

1.	Calculate the value of equivalent inductance for series subtracting polarity of two coils whose self inductances are 14 H, 5 H, and mutual inductance value is 1 H.(a) 15 H(b) 17 H(c) 12 H(d) 10 HThis question was posed to me in a job interview.The doubt is from Regenerative Braking of DC Shunt Motors in chapter Braking of DC Motors & Induction Motors of Electric Drives
Answer» The correct option is (b) 17 H Easy explanation: The equivalent inductance for series subtracting of two coils is Leq=L1+L2-2M=14+5-2=17 H. The value of equivalent inductance decreases due to NEGATIVELY mutually induced e.m.f in case of the MAGNETICALLY COUPLED circuit.

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