The scalar quantity among the following is

Options

A. weight of body
B. temperature gradient
C. electric potential
D. magnetic field strength

Answer

To determine which of the given options is a scalar quantity, we will analyze each option based on the definitions of scalar and vector quantities.

### Step-by-Step Solution:

1. **Understanding Scalar and Vector Quantities**:
- A scalar quantity has only magnitude and no direction. Examples include temperature, mass, and energy.
- A vector quantity has both magnitude and direction. Examples include force, velocity, and weight.

2. **Analyzing Each Option**:
- **Option A: Weight**:
- Weight is a force acting on an object due to gravity. Since force has both magnitude and direction, weight is a vector quantity.
- **Conclusion**: Weight is not a scalar quantity.

- **Option B: Temperature Gradient**:
- The temperature gradient refers to the rate of change of temperature with respect to distance, expressed as dT/dx. This quantity has a direction (it points from higher to lower temperature) and thus is a vector quantity.
- **Conclusion**: Temperature gradient is not a scalar quantity.

- **Option C: Electric Potential**:
- Electric potential is defined as the work done per unit charge in bringing a charge from infinity to a point in an electric field. It is derived from the dot product of electric field (a vector) and displacement (also a vector), which results in a scalar quantity.
- **Conclusion**: Electric potential is a scalar quantity.

- **Option D: Magnetic Field Strength**:
- Magnetic field strength is a measure of the magnetic force experienced by a unit North Pole at a point in space. It has both magnitude and direction, making it a vector quantity.
- **Conclusion**: Magnetic field strength is not a scalar quantity.

3. **Final Answer**:
- The only scalar quantity among the given options is **Electric Potential (Option C)**.