Question

An electron is moving along positive x-axis. To get it moving on an anticlockwise circular path in x-y plane, a magnetic filed is applied?

• A. Along positive y-axis
• B. Along positive z-axis
• C. Along negative y-axis
• D. Along negative z-axis

Answer 1

The correct option is B Along positive z-axis

The given situation can be drawn as follows
According to figure, for deflecting electron in x-y plane, force must be acting on it along y-axis.
Hence according to Right hand thumb rule, magnetic field directed along positive y- axis.