When current flows through a conductor, then the order of drift velocity of electrons will be

Options

A. `10^(10)cms^(-1)`
B. `10^(-2)cms^(-1)`
C. `10^(4)cms^(-1)`
D. `10^(-1)cms^(-1)`

Answer

To determine the order of drift velocity of electrons when current flows through a conductor, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Drift Velocity**:
- Drift velocity is the average velocity that a charge carrier, such as an electron, attains due to an electric field. It is typically very small compared to the random thermal velocities of electrons.

2. **Order of Drift Velocity**:
- The drift velocity of electrons in a conductor is generally of the order of \(10^{-4}\) meters per second. This is a fundamental fact that can be found in textbooks on electricity and magnetism.

3. **Conversion to Centimeters per Second**:
- Since the question may require the answer in different units, we can convert the drift velocity from meters per second to centimeters per second.
- We know that \(1 \text{ meter} = 100 \text{ centimeters}\). Therefore, to convert \(10^{-4} \text{ m/s}\) to centimeters per second:
\[ 10^{-4} \text{ m/s} \times 100 \text{ cm/m} = 10^{-2} \text{ cm/s} \]

4. **Conclusion**:
- Thus, the order of drift velocity of electrons in a conductor is \(10^{-4} \text{ m/s}\) or \(10^{-2} \text{ cm/s}\).

### Final Answer:
- The order of drift velocity of electrons when current flows through a conductor is \(10^{-4} \text{ m/s}\) or \(10^{-2} \text{ cm/s}\).

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