Question

There is a magnetic field acting in a plane perpendicular to this sheet
of paper downwards into the paper. A particle starts moving in the
plane of the paper from left to right. The path
indicated by it could be due to which particle:

Answer 1

Answer:

Since, Magnetic force will always act perpendicular to velocity.

=> Radial Force in motion = Magnetic Force

Since, Radius of curvature is constant.

=> Trajectory of Charge 'q'is circle.

3) Using above R, where m, q, B are given .

Area of Circle, A :

Hence, Area of Circle is proportional to Kinetic Energy.