Electron in a magnetic field, Potential due to a charged rod
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3) The uniform 30 mT magnetic field in figure 3 (see attachment) points in the positive z-direction. An electron enters the region of magnetic field with a speed of 5.0 * 10^6 m/s and at an angle of 30 degrees above the xy-plane. Find the radius "r" and the pitch "p" of the electron's spiral trajectory.
4) Figure 4 shows a thin rod of length L and charge Q. Find an expression for the electric potential and a distance "z" away from the center of rod on the line that bisects the rod.
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