Which one is a vector quantity?

Options

A. Time
B. Temperature
C. Magnetic flux
D. Magnetic field intensity

Answer

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

### Step-by-Step Solution:

1. **Understand the Definitions**:
- A **scalar quantity** has only magnitude (size) and no direction.
- A **vector quantity** has both magnitude and direction.

2. **Analyze Each Option**:
- **Option 1: Time**
- Time is measured in units such as seconds, minutes, or hours. It does not have a direction; it only has magnitude.
- **Conclusion**: Time is a scalar quantity.

- **Option 2: Temperature**
- Temperature is measured in degrees (Celsius, Fahrenheit, Kelvin) and indicates how hot or cold something is. Like time, it does not have a direction.
- **Conclusion**: Temperature is a scalar quantity.

- **Option 3: Magnetic Flux**
- Magnetic flux is defined as the number of magnetic field lines passing through a given area. It is measured in Weber (Wb) and does not have a direction associated with it.
- **Conclusion**: Magnetic flux is a scalar quantity.

- **Option 4: Magnetic Field Intensity**
- Magnetic field intensity (or magnetic field strength) is a measure of the strength of the magnetic field in a given area. It is defined as the force experienced by a unit charge moving with unit velocity perpendicular to the direction of the magnetic field. This definition implies that it has both magnitude and direction.
- **Conclusion**: Magnetic field intensity is a vector quantity.

3. **Final Answer**:
- The vector quantity among the options provided is **Option 4: Magnetic Field Intensity**.