A closely wound, circular coil with radius $2\mathrm{.}30$ cm has $790$ turns.

Part A

What must the current in the coil be if the magnetic field at the center of the coil is $0\mathrm{.}0750$ T $?$

Express your answer with the appropriate units.

Part B

At what distance $\backslash ($ x $\backslash )$ from the center of the coil, on the axis of the coil, is the magnetic field half its value at the center?

Express your answer with the appropriate units.