What is the work done in moving a unit positive charge from infinity to that point in electric field called?

Options

A. Electric potential
B. Potential difference
C. Electric current
D. Electric circuits

Answer

To solve the question "What is the work done in moving a unit positive charge from infinity to that point in an electric field called?", we can follow these steps:

### Step 1: Understand the Concept of Electric Potential
Electric potential is a key concept in electrostatics. It refers to the amount of work done in bringing a unit positive charge from a reference point (usually taken at infinity) to a specific point in an electric field.

### Step 2: Define the Work Done
The work done in moving a charge in an electric field is defined as the energy required to move that charge against the electric field. When we talk about moving a unit positive charge, we are specifically referring to the work done to bring a charge of +1 coulomb from infinity to a point in the field.

### Step 3: Relate Work Done to Electric Potential
The work done (W) in moving a unit positive charge (q = 1 C) from infinity to a point in the electric field is mathematically expressed as:
\[ W = V \cdot q \]
where \( V \) is the electric potential at that point. Since we are moving a unit charge, the equation simplifies to:
\[ W = V \]
Thus, the work done in moving a unit positive charge from infinity to a point in the electric field is equal to the electric potential at that point.

### Step 4: Conclusion
Therefore, the work done in moving a unit positive charge from infinity to that point in an electric field is called **Electric Potential**.

---