Question

The direction of the force acting on the electron entering perpendicular to the magnetic field as shown in the figure, will be:

• A. towards left
• B. towards right
• C. perpendicular to the plane of paper downwards
• D. perpendicular to the plane of paper upwards

Hint:

For a negatively charged particle moving in a magnetic field, apply Fleming’s Left-Hand Rule and reverse the direction obtained.

Answer 1

The Correct Option is D

The force on a moving charge in a magnetic field is determined using Fleming's Left-Hand Rule (for negative charges like electrons).
- The magnetic field is directed upwards (as per the figure).
- The electron's velocity is towards the left.
- Applying Fleming's Left-Hand Rule, the force acts perpendicular to the plane of the paper upwards.
Since an electron is negatively charged, the direction of force is opposite to what would be experienced by a positive charge.