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which is not a unit of electrostatic potential?

a)volt c)newton/coulomb

b)joule/coulomb d)newton-metre/coulomb

Option a) Volt : is a unit of electrostatic potential.

Option b) Joule / Coulomb: Energy per unit charge. Electrostatic potential is electrostatic potential energy gained or lost in moving a unit charge in an electric field. Hence, Joule / Coulomb is also a unit of Electrostatic potential.

Option c) Newton/Coulomb : Force per unit charge which is electric field.

**Hence, option c) is not a unit of electrostatic potential.**

Option d) Newton-metre/Coulomb: Newton-metre is Joule. Hence Joule / Coulomb is a unit of electrostatic potential.

Regards

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