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JEE Main20238 Apr 2023Morning ShiftPhysicsMagnetic Effects of CurrentActual

A charge particle moving in magnetic field B , has the components of velocity along B as well as perpendicular to B . The path of the charge particle will be

Options

  1. Ahelical path with the axis perpendicular to the direction of magnetic field B
  2. Bhelical path with the axis along magnetic field B
  3. Ccircular path
  4. Dstraight along the direction of magnetic field B

Correct answer

B. helical path with the axis along magnetic field B

Step-by-step solution

The formula to calculate the radius of the path followed by the charged particle under an external magnetic field can be written as r = m v B q       . . . 1 The perpendicular component of velocity results in circular motion, while the parallel component results in linear motion. Hence, the path of the charged particle is helical in nature, the axis of which lies along the direction of the magnetic field.

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