An electron carrying a charge \(-e=-1.60 \times 10^{-19} \mathrm{C}\) moves in a straight line at a speed \(v=3.0 \times 10^{7} \mathrm{~m} / \mathrm{s}\). What are the magnitude and direction of the magnetic field caused by the electron at a point \(\mathrm{P} 10 \mathrm{~mm}\) ahead of the electron and \(20 \mathrm{~mm}\) away from its line of motion?

Data from Figure 28.35