Question

A charged particle moves with velocity v in a uniform magnetic field $\vec { B }$ . The magnetic force experienced by the particle is

• A. Always zero
• B. Never zero
• C. Zero, if $\vec { B }$ and $\vec { v }$ are perpendicular
• D. Zero, if $\vec { B }$ and $\vec { v }$ are parallel

Answer 1

Answer: (D)

Zero, if $\vec { B }$ and $\vec { v }$ are parallel

Answer 2

$\vec { F } = q ( \vec { v } \times \vec { B } )$ ; if $\vec { F } = 0$