If a proton is traveling north directly above the wire, what is the direction of the magnetic force on the proton due to the wire?

Direction is downwards

Explanation:

This is by employing Flemings Right hand rule which says If you point your pointer finger in the direction the positive charge is moving, and then your middle finger in the direction of the magnetic field, your thumb points in the direction of the magnetic force pushing on the moving charge.

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6

massxgravity x heght=weightxheight= pe

4900=490xh

h=10