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A magnetic field B=B(0)hatj exists in th...

A magnetic field `B=B_(0)hatj` exists in the region `a lt x lt 2a` and `B=-B_(0)hatj`, in the region `2a lt x lt 3a`, where `B_(0)` is a positive constant. A positive point charge moving with as velocity `v=v_(0)hati`, where `v_(0)` is a positive constant, enters the magnetic field at `x=a`, the trajectory of the charge in this region can be like:

A

B

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D

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Verified by Experts

The correct Answer is:
A
Magnitic field in the region `a lt x lt 2a` will turn the particle towards positive `Z`-axis while the magnetic field in the region `2a lt x lt 3a` will exert force in opposite direction.The turning is smooth because the magnetic force is NOT impulsive.
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