The magnetic field is uniform for y > 0 and points into the plane. The magnetic field is uniform and points out of the plane for y 0 . A proton denoted by filled circle leaves y = 0 in the - y -direction with some speed as shown below. Which of the following best denotes the trajectory of the proton?

Step-by-step solution

Following Fleming's left hand rule, proton initially rotates clockwise and it enters region y > 0 with its velocity in positive y -direction. Here in region y > 0 , magnetic field is into plane of paper. So, proton again follows left hand rule and now tend to rotate anti-clockwise as shown below.