JEE Main · 2026 · 21 Jan 2026 · Shift 1 · Magnetic Effects of Current

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A current carrying 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 :

(A) $a = g$ ✓ Correct
(B) $a > g$
(C) $a = 0$
(D) $0 <$ a $<$ g

Answer: (A)

Solution

Inside the solenoid the magnetic field lies along its vertical axis, and the charge is released to move along that same axis, so its velocity stays parallel to the field. The magnetic force

Q v \times B

is then zero, leaving gravity as the only force, so the acceleration is

a = g

JEE Main · 2026 · 21 Jan 2026 · Shift 1 · Single correct option

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