M$1)(20$ points$)$ An RLC circuit is driven at a peak voltage of $5$ V at a frequency of

$900$ MHz$.$ Take R $=1\mathrm{.}7,$ C $=19\mathrm{.}3$ pF$,$ L $=6$ nH$.$

a$)$ What is the peak current through this circuit?

b$)$ What is the phase difference between the supply voltage and the current?