Electronics Handbook/Components/Inductors/Parallel Connection

More than one inductors can be connected in series or in parallel to increase or decrease inductance

${\frac {1}{R_{T}}}={\frac {1}{L_{1}}}+{\frac {1}{L_{2}}}+...+{\frac {1}{L_{n}}}$

When connect two inductors of the same inductance in parallel . The total inductance is halved