CUET · PHYSICS · PYQ PAPER 2023
An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true ?
- A The electron will be accelerated along the axis
- B The electron path will be circular about the axis
- C The electron will have helical path
- D The electron will continue to move with uniform velocity along the axis of the solenoid
Answer & Solution
Correct Answer
(D) The electron will continue to move with uniform velocity along the axis of the solenoid
Step-by-step Solution
Detailed explanation
The magnetic field inside a long solenoid is axial. Electron velocity \(\vec{v}\) is parallel to the magnetic field \(\vec{B}\). Magnetic force \(\vec{F} = q(\vec{v} \times \vec{B})\). Since \(\vec{v} \parallel \vec{B}\), \(\vec{v} \times \vec{B} = 0\). \(\vec{F} = 0\). The…
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