The number density of free electrons in a copper conductor is estimated at `8.5 xx 10^(28) m^(-3)`. How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of cross-section of the wire is `2.0 xx 10^(-6)m^(2)` and it is carrying a current of 3.0A.

Explanation

To solve the problem, we need to determine how long it takes for an electron to drift from one end of a copper wire to the other. We will use the given parameters and the relationship between current, drift velocity, and time.

### Step-by-Step Solution:

1. **Identify the given values:**
- Number density of free electrons, \( n = 8.5 \times 10^{28} \, \text{m}^{-3} \)
- Length of the wire, \( L = 3.0 \, \text{m} \)
- Cross-sectional area of the wire, \( A = 2.0 \times 10^{-6} \, \text{m}^2 \)
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