A single current-carrying circular loop of radius R=5 cm is placed next to a long, straight wire, as shown in the figure. The current in the wire points to the right and is of magnitude I = 3.0 A.The current in the loop is clockwise and is also of magnitude I = 3.0 A.

a) Find the net magnetic field (magnitude and direction) at the center of the loop. b) Find the magnetic force on a proton when at the center of the loop, if the proton is moving with a velocity of 4.210⁵m/s in a direction out of the page. ?_o= 4?10^-7T.m/A q_p= 1.610^-19C

R R/2