a student is performing an experiment in which electrons with a speed of 10^5 m/s enter a region with a uniform magnetic field of magnitude 10^-1 T and perpendicular to the velocity of the electron. The student observes the deflection of the electrons by the magnetic field. For each of the following types of forces explain if the student needs to consider them in their analysis and why of why not. a: gravitational force b: magnetic force c: electric force