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JEE Main · 2023 · 11 Apr 2023 · Shift 2 · Magnetic Effects of Current

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An electron is allowed to move with constant velocity along the axis of current carrying straight solenoid.
A. The electron will experience magnetic force along the axis of the solenoid.
B. The electron will not experience magnetic force.
C. The electron will continue to move along the axis of the solenoid.
D. The electron will be accelerated along the axis of the solenoid.
E. The electron will follow parabolic path-inside the solenoid.

Choose the correct answer from the options given below:
  1. (A)B, C and D only
  2. (B)B and C only✓ Correct
  3. (C)A and D only
  4. (D)B and E only

Answer: (B)

Solution

The magnetic force on a charged particle is . Inside a solenoid, the magnetic field is parallel to the axis. Since the electron moves along the axis, the angle between and is , making . Therefore, the electron experiences no magnetic force (B is true) and continues to move with constant velocity along the axis (C is true).

JEE Main · 2023 · 11 Apr 2023 · Shift 2 · Single correct option

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