A magnetic field \( \mathbf{B}=B_{0} \hat{\mathbf{j}} \) exists in the region \( ax2 a \) and \(...

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A magnetic field \( \mathbf{B}=B_{0} \hat{\mathbf{j}} \) exists in the region \( ax2 a \) and \( \mathbf{B}=-B_{0} \hat{\mathbf{j}} \), in the region \( 2 ax3 a \), where \( B_{0} \) is a positive constant. A positive point charge moving with a velocity \( \mathbf{v}=v_{0} \hat{\mathbf{i}} \), 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)
(c)
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