Electric potential||Electric Potential difference between two points

Electric potential Energy||Electric Potential

How is potential difference between two points expressed?

In an uniform electric field,the potential difference between two points separated by 10cm is 2 volt.Magnitude of electric field .

In a region,uniform electric field is 10V/m ,then potential difference between two points which are separated by 3m may be equal .??

A 5C charge experience a force of 2000 N when moved between two points separated by a distance of 2 cm in a uniform electric field. The potential difference between the two points is

Name the instrument used to measure (i) electric current in a circuit, (ii) potential difference between two points in a circuit.