Final answer:
The force exerted by the magnetic field on an electron is perpendicular to both the velocity of the electron and the magnetic field.
Step-by-step explanation:
The force exerted by the magnetic field on an electron depends on the direction of the magnetic field and the velocity of the electron. To determine the direction of the force, you can use the right-hand rule. If the velocity of the electron is perpendicular to the magnetic field, the force will be perpendicular to both the velocity and the magnetic field.
For example, if the electron is moving in the +x-direction and the magnetic field is pointing in the +y-direction, the force on the electron will be in the +z-direction.
It is important to note that the force on a charged particle due to a magnetic field is always perpendicular to both the velocity of the particle and the magnetic field.