A particle initially moving towards south in a vertically downward magnetic field is deflected toward the east. What is the sign of the charge on the particle?

Explanation

To determine the sign of the charge on the particle that is deflected towards the east while moving south in a vertically downward magnetic field, we can follow these steps:

### Step 1: Identify the Directions
- The particle is moving towards the south. We can represent this direction as negative y-axis (−j).
- The magnetic field is directed vertically downward, which we can represent as negative z-axis (−k).
- The deflection of the particle is towards the east, which we can represent as positive x-axis (+i).

### Step 2: Use the Right-Hand Rule
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