Two solenoids L$\_($A$)$ and L$\_($B$),$ spaced close to each other and sharing the same cylindrical axis, have $300$ and $600$ turns, respectively. A current of $2\mathrm{.}50$ A in solenoid L$\_($A$)$ produces an average flux of $350\backslash$mu Wb through each turn of L$\_($A$)$ and a flux of $120\mathrm{.}0\backslash$mu Wb through each turn of L$\_($B$).$

$($b$)$ What is the inductol inductance of the two solenoids.

$($c$)$ What emf is inductance of A $?$