Define electric potential difference between two points.

When a charge of 3C is placed in a uniform electric field, it experiences a force of 3000N. The potential difference between two points separated by a distance of 1cm within this field is

There exists a potential difference of 5 V between two points in an electric field. Work done in moving a charge Of 7 C from one point to the other is [

There exists a potential difference of 5V between two points in an electric field. Work done in moving a charge of 7C from one point to the other is

What is the potential difference between two points 10 cm apart on a charged conductor in air.