The SI unit of electric field is:

Concept:

Electric Field

• The electric field or electric field intensity at any point is the strength of the electric field at the point.
• It is defined as the force experienced by the unit positive charge placed at that point.

Where F = force and qo = small test charge

• The magnitude of the electric field is

Where K = constant called electrostatic force constant, q = sorce charge and r = distance

Electric Potential

• Electric potential is equal to the amount of work done per unit charge by an external force to move the charge q from infinity to a specific point in an electric field.

• The difference in electric potential between two points is called potential difference or voltage.
• The voltage is the electric field divided by the distance.

Explanation:

• The electric field is the force by charge or potential multiplied by the distance.
• SI Unit of electric potential is volt and SI unit of distance is meter.
• Unit of potential by distance is Volt / meter or V m^-1.

So, the correct option is Vm-1.