SI unit of electrostatic potential is

Options

A. ohm
B. coulomb
C. volt
D. ampere

Answer

To determine the SI unit of electrostatic potential, let's follow these steps:

### Step-by-Step Solution:

1. **Understanding Electrostatic Potential**:
Electrostatic potential (V) at a point in an electric field is defined as the work done (W) by an external agent in bringing a unit positive charge (q = 1 C) from infinity to that point against the electric field.

2. **Formula for Electrostatic Potential**:
The formula for electrostatic potential is given by:
\[ V = \frac{W}{q} \]
where:
- \( V \) is the electrostatic potential,
- \( W \) is the work done,
- \( q \) is the charge.

3. **Units of Work Done**:
The SI unit of work done (W) is Joules (J).

4. **Unit of Charge**:
The SI unit of electric charge (q) is Coulombs (C).

5. **Calculating the Unit of Electrostatic Potential**:
Substituting the units into the formula for electrostatic potential:
\[ V = \frac{W}{q} = \frac{\text{Joules (J)}}{\text{Coulombs (C)}} \]

6. **Final Unit of Electrostatic Potential**:
Therefore, the SI unit of electrostatic potential is:
\[ \text{Volts (V)} = \frac{\text{J}}{\text{C}} \]

### Conclusion:
The SI unit of electrostatic potential is **Volts (V)**.

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