Question

Two identical induction coils each of inductance $L$ are jointed in series are placed very close to each other such that the winding direction of one is exactly opposite to that of the other, what is the net inductance?

• A. $L^2$
• B. $2L$
• C. $\frac{L}{2}$
• D. zero

Answer 1

The correct option is D zero

When two inductance coil are joined in series, such that the winding of one is exactly opposite to each other the emf produced in the two coils are out of phase such that they cancel out