Final answer:
The magnitude of the force on the electron when it is between the plates can be calculated using the formula F = qE, where F is the force, q is the charge of the electron, and E is the electric field strength between the plates.
Step-by-step explanation:
The magnitude of the force on the electron when it is between the plates can be calculated using the formula F = qE, where F is the force, q is the charge of the electron, and E is the electric field strength between the plates.
To find the electric field strength, we can use the expression E = V/d, where V is the potential difference between the plates and d is the separation between the plates.
The force on an electron can be determined once we know the charge of the electron and the electric field strength between the plates.