An electron is projected along the axis of circular conductor carrying current I. Electron will experience (a) no force. (b) a force along the axis. (c) a force at angle 30° with the axis. (d) a force perpendicular to axis.

Answer: (a). On the axis of a circular loop, B is along the axis. Electron velocity is also along the axis, so θ = 0° or 180° and F = evBsin θ = 0. So the answer is (a) no force.

An electron is projected along the axis of circular conductor… | MHT CET 2023 (11 May, Shift 1)

Q41MHT CET 2023 · 11 MAY · SHIFT 1Easy

Moving Charge in a Magnetic Field

An electron is projected along the axis of circular conductor carrying current I. Electron will experience

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Answer: (a)

On the axis of a circular loop, $\vec{B}$ is along the axis.
Electron velocity is also along the axis, so $\theta = 0^\circ$ or $180^\circ$ and $F = evB\sin\theta = 0$ .
So the answer is (a) no force.

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