Question

A cation enters in the uniform magnetic field region and moves in a semicircular path in the direction indicated in above figure. Identify the direction of the magnetic field?

• A. Upward in the plane of the page
• B. To the left in the plane of the page
• C. To the right in the plane of the page
• D. Out of the plane of the page
• E. Into the plane of the page

Answer 1

Answer: (D)

Out of the plane of the page

The direction of force and velocity is shown in the figure where $F=q(v\times B)$

Using Right hand rule, the direction of magnetic field is out of the plane of paper.