Not from book$(2)$: A toroidal solenoid has mean radius $12\mathrm{.}0$ cm and cross$-$sectional area $0\mathrm{.}600$ cm$2.($a$)$ How many turns does the solenoid have if its inductance is $0\mathrm{.}100$ mH$?($b$)$ What is the resistance of the solenoid if the wire from which it is wound has a resistance per unit length of $0\mathrm{.}0760/$m$?$