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JEE Main202621 January 2026Morning ShiftPhysicsMagnetic Effects of CurrentActual

A current carrying solenoid is placed vertically and a particle of mass m with charge Q is released from rest. The particle moves along the axis of solenoid. If g is acceleration due to gravity then the acceleration (a) of the charged particle will satisfy :

Options

  1. Aa>g
  2. B0 < a < g
  3. Ca=0
  4. Da=g

Correct answer

D. a=g

Step-by-step solution

Inside a solenoid, magnetic field B is uniform and parallel to the axis. Particle moves along the axis, so velocity v is parallel to B . Magnetic force F = Q( v B ) = 0 (since v B ) Only gravity acts on the particle. Acceleration a = g

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