A magnetic field $$\overrightarrow{B} = B_0\hat{j}$$ exists in the region a < x < 2a and $$\overrightarrow{B} = -B_0 \hat{j}$$, in the region 2a < x < 3a, where $$B_0$$ is a positive constant. A positive point charge moving with a velocity $$\overrightarrow{v} = v_0 \hat{i}$$, 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,