An electric field of `20 N//C` exists along the x-axis in space. Calculate the potential difference `V_B - V_A` where the points A and B are given by
a. `A=(0,0), B=(4m, 2m)`
b. `A=(4m,2m),B=(6m,5m)`

Explanation

To solve the problem, we will calculate the potential difference \( V_B - V_A \) for the two given pairs of points in an electric field of \( 20 \, \text{N/C} \) along the x-axis.

### Part (a): Points A and B
1. **Identify the electric field and points**:
- The electric field \( E = 20 \, \text{N/C} \) is directed along the x-axis.
- Point A is at \( (0, 0) \) and point B is at \( (4 \, \text{m}, 2 \, \text{m}) \).

2. **Use the formula for potential difference**:
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