Step 1: Force on a charged particle in a magnetic and electric field.
The total force on a charged particle in the presence of both electric and magnetic fields is given by the Lorentz force equation:
\[
F = q(E + v \times B)
\]
where:
- \( E \) is the electric field,
- \( B \) is the magnetic field,
- \( v \) is the velocity of the particle,
- \( q \) is the charge.
Step 2: Final answer.
Thus, the total force is:
\[
F = q(E + v \times B)
\]