I just want to know the direction for this question. I use the right hand rule and it shows the magnetic field is going into the page but that is not the answer neither is to the left or right. The answer could be any of these choices up, down, out of the page or the magnitude is zero. Basing on my calculation for the magnitude, it is 4.54*10^-19 and it is correct.Can somebody help me with the direction part?
One common type of cosmic ray is a proton traveling at close to the speed of light. If the proton is traveling downward, as shown in the figure below, at a speed of 2.03 ✕ 10^7 m/s, what are the magnitude and direction of the magnetic field at point B?
www.webassign.net/katzpse1/30-p-014.png