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A charge moving with velocity \( v \) in \( X \)-direction is subjected to a field of magnetic induction in negative \( X \)-direction. As a result, the charge will
- remain unaffected
- start moving in a circular path \( Y-Z \) plane
- retard along \( X \)-axis
- move along a helical path around \( X \)-axis
Correct answer: remain unaffected
Solution
The magnetic force on a moving charge is given by the Lorentz force, which depends on the cross product of velocity and magnetic field vectors. Since the velocity and magnetic field are parallel (both along the X-axis), the cross product is zero, and the charge remains unaffected.
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