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JEE Main · 2022 · 29 Jun 2022 · Shift 2 · Magnetic Effects of Current

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Given below are two statements :

Statement I: The electric force changes the speed of the charged particle and hence changes its kinetic energy: whereas the magnetic force does not change the kinetic energy of the charged particle.

Statement II: The electric force accelerates the positively charged particle perpendicular to the direction of electric field. The magnetic force accelerates the moving charged particle along the direction of magnetic field. In the light of the above statements, choose the most appropriate answer from the options given below:
  1. (A)Both Statement I and Statement II are correct.
  2. (B)Both Statement I and Statement II are incorrect.
  3. (C)Statement I is correct but Statement II is incorrect.✓ Correct
  4. (D)Statement I is incorrect but Statement II is correct.

Answer: (C)

Solution

Statement I is correct: Electric force can do work on a charged particle and change its kinetic energy. Magnetic force is always perpendicular to velocity, so it does no work and cannot change kinetic energy ().

Statement II is incorrect: Electric force acts along (or opposite to) the electric field direction, not perpendicular. Magnetic force acts perpendicular to both velocity and magnetic field, not along the field direction.

JEE Main · 2022 · 29 Jun 2022 · Shift 2 · Single correct option

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