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In this section we study electric and magnetic fields with different orientations to see their effects on neutral, positive and negative charges. For the electric field case the particles have zero initial velocity. In second case with a magnetic field in the $$x$$-direction the initial velocity is zero but there is a check-box so that you can give the particles an initial velocity in the $$+x$$ direction. In the third case the magnetic field is rotated so that it points into the screen.