Question

If an induction coil is open then its $L$ and $R$ become

• A. $\infty ,0$
• B. $0,\infty$
• C. $\infty ,\infty$
• D. $0,0$

Answer 1

The correct option is B $0,\infty$

An Inductor is equivalent to a Short Circuit to Direct Current, because once the Storage Phase has finished, the Current, iL, that flows through it is stable, $iL=V/R$, no Self Induced e.m.f. is produced and vL is zero. The Inductor acts like an ordinary connecting wire, its Resistance is zero and L becomes infinity.