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A magnetic field vec(B) = B(0)hat(j) , ...

A magnetic field ` vec(B) = B_(0)hat(j)` , exists in the region `a ltxlt2a` , and vec(B) = -B_(0) hat(j)` , in the region `2a lt xlt 3a`, where `B_(0)` is a positive constant . A positive point charge moving with a velocity `vec(v) = v_(0) hat (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

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