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 of how long it takes for an electron to drift from one end of a copper wire to the other, we will follow these steps:

### Step 1: Identify the given values
- Number density of free electrons, \( n = 8.5 \times 10^{28} \, \text{m}^{-3} \)
- Length of the wire, \( L = 3.0 \, \text{m} \)
- Area of cross-section of the wire, \( A = 2.0 \times 10^{-6} \, \text{m}^2 \)
- Current flowing through the wire, \( I = 3.0 \, \text{A} \)

...