In drift velocity, the free electrons drift in which direction concerning the applied electric field ?

Options

A. In the same direction.
B. In the opposite direction.
C. Direction-less.
D. Both B and C

Explanation

To solve the question regarding the direction of drift velocity of free electrons in relation to the applied electric field, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Drift Velocity**:
- Drift velocity refers to the average velocity that free charge carriers, such as electrons, acquire due to an electric field applied across a conductor.

2. **Identifying the Charge of Electrons**:
- Electrons are negatively charged particles. This is a crucial point because the direction of the force acting on a charge in an electric field depends on the sign of the charge.

3. **Direction of the Electric Field**:
- By convention, the direction of the electric field (E) is defined as the direction in which a positive charge would move. Therefore, if we denote the direction of the electric field as pointing to the right, we need to analyze how electrons respond to this field.

4. **Force on Electrons**:
- The force (F) acting on a charge in an electric field is given by the equation:
\[ F = qE \]
where \( q \) is the charge and \( E \) is the electric field. For electrons, since \( q \) is negative, the force acting on them will be in the opposite direction to that of the electric field.

5. **Direction of Drift**:
- Since the force on the electrons is in the opposite direction to the electric field, the drift velocity of the electrons will also be in the opposite direction to the applied electric field.

6. **Conclusion**:
- Therefore, concerning the applied electric field, free electrons drift in the opposite direction.

### Final Answer:
The free electrons drift in the opposite direction concerning the applied electric field.