$[30$ Points$]$ Problem $2$ The $6\mathrm{.}8$ V Zener diode shunt regulator has $V_2=6\mathrm{.}8V$ at $I_2=5mA,r_2=20,$ and $I_{ZK}=0\mathrm{.}2mA.$

$[10]$ Find the no$-$load output voltage when $V=10V.$

$[10]$ Calculate the line regulation in $m\frac{V}{N}$ with $V+$ changing by $+-1V.$

$[10]$ Calculate the load regulation when a load $R_L$ is connected at the output drawing $1$ mA of current.