Question $11(1$ point$)$ Two flat, circular coils, each with a radius R and wound with N turns, are mounted along the same axis so that they are parallel a distance d apart. What is the magnetic field at the midpoint of the common axis if a current i flows in the same direction through each coil? Use that R $=7\mathrm{.}0$ cm$,$ N $=11$ turns, i $=2\mathrm{.}1$ A and d $=17\mathrm{.}9$ cm$.$ Enter the numerical value $($in units of milliTesla$)$ with at least $3$ sig.figs. in the box below.