A charge particle moving in magnetic field B, has the components of velocity along B as well as perpendicular to B. The path of the charge particle will be (a) helical path with the axis along magnetic field B (b) straight along the direction of magnetic field B (c) circular path (d) helical path with the axis perpendicular to the direction of magnetic field B

Answer: (a). v⊥ gives circular motion in the plane perpendicular to B. v∥ is unaffected ( F = 0 along B), so the particle drifts steadily along B. Circle + uniform drift = helix with its axis along B. So the answer is (a).

A charge particle moving in magnetic field B, has the components of… | JEE Main 2023 (8 Apr, Shift 1)

Q44JEE Main 2023 · 8 APR · SHIFT 1Easy

Moving Charge in a Magnetic Field

A charge particle moving in magnetic field B, has the components of velocity along B as well as perpendicular to B. The path of the charge particle will be

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Answer: (a)

$v_\perp$ gives circular motion in the plane perpendicular to $\vec B$ .
$v_\parallel$ is unaffected ( $F = 0$ along $\vec B$ ), so the particle drifts steadily along $\vec B$ .
Circle + uniform drift = helix with its axis along $\vec B$ .
So the answer is (a).

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