Figure 1 shows a non-uniform electric field through a region of space with 4 positions marked. Consider the electric potential difference between any two points:

1. If we go from point a to point b, will the electric potential increase or decrease?

2. If we go from point a to point c, will the electric potential increase or decrease?

3. If we go from point b to point d, will the electric potential increase or decrease?

4. If we go from point c to point d, will the electric potential increase or decrease?

5. If an electron is moved from point b to point c, will its potential energy increase or decrease?