An electron is projected with uniform velocity along the axis inside a current carrying long solenoid. Then: (a) the electron will experience a force at 45° to the axis and execute a helical path. (b) the electron will be accelerated along the axis. (c) the electron path will be circular about the axis. (d) the electron will continue to move with uniform velocity along the axis of the solenoid.

Answer: (d). Inside a long solenoid B is along the axis. Electron moves along the axis, so v ∥ B and F = 0. So the answer is (d) it continues with uniform velocity along the axis.

An electron is projected with uniform velocity along the axis inside… | JEE Main 2024 (4 Apr, Shift 1)

Q29JEE Main 2024 · 4 APR · SHIFT 1Easy

Moving Charge in a Magnetic Field

An electron is projected with uniform velocity along the axis inside a current carrying long solenoid. Then:

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Answer: (d)

Inside a long solenoid $\vec{B}$ is along the axis.
Electron moves along the axis, so $\vec{v} \parallel \vec{B}$ and $F = 0$ .
So the answer is (d) it continues with uniform velocity along the axis.

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Moving Charge in a Magnetic Field question from JEE Main 2024 (4 Apr, Shift 1)

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