What is the total force on a moving charge in a cubical region of cross magnetic and electric fields?

Explanation

To find the total force on a moving charge in a region where there are both electric and magnetic fields, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Forces Acting on the Charge**:
- When a charge \( q \) moves in an electric field \( \mathbf{E} \) and a magnetic field \( \mathbf{B} \), it experiences two forces: the electric force and the magnetic force.

2. **Calculate the Electric Force**:
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