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Solution


Q.

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               [2023]
1 straight along the direction of magnetic field B  
2 helical path with the axis perpendicular to the direction of magnetic field B  
3 helical path with the axis along magnetic field B  
4 circular path  

Ans.

(3)

Due to the component of velocity (v1) along the magnetic field, no force will be experienced by the particle.

So v1 remains unchanged.

But due to the component v2 magnetic force acts towards the centre, i.e., moving it in a circular path. So the path is helical with the axis parallel to the magnetic field B.