If electron passes through axis of solenoid the movement will be:
Correct answer: D. No force acts on it
- A. Towards the outward
- B. Towards the inward
- C. Parallel to its motion
- D. No force acts on it
Explanation
The electron is moving along the axis with velocity V Force = q(V x B) Velocity and magnetic field are in the same direction or at an angle of 180 V x B = VBsin(0 or 180) = 0 Force = 0 The image shows the direction of the magnetic field inside a solenoid.
This question appeared on the NUMS 2016 paper, which you can sit online with every answer explained.
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About Charged Particle in a Magnetic Field
A charged particle moving through a magnetic field experiences the Lorentz force, which is perpendicular to both its velocity and the field. The motion may be circular or helical, with questions involving radius, angular frequency, time period, and work done. A stationary charge feels no magnetic force.
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