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...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 (which is now the \(x\) direction) and the particles have an initial velocity in the \(+z\) direction.
