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When a charged particle moving with velocity v̅ is subjected to a magnetic field of induction B̅, the force on it is non-zero. This implies that
- angle between v̅ and B̅ can have any value other than 90°
- angle between v̅ and B̅ can have any value other than zero and 180°
- angle between v̅ and B̅ can only be 90°
- angle between v̅ and B̅ can only be zero or 180°
Correct answer: angle between v̅ and B̅ can have any value other than zero and 180°
Solution
The magnetic force on a charged particle is given by F̅ = q(v̅ × B̅), which depends on the sine of the angle between v̅ and B̅. The force is non-zero when the angle is neither 0° nor 180°, as sin(0°) = sin(180°) = 0.
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