Two wires of equal length, one of copper and the other of manganin (an alloy) having the same thickness. Which one can be used for (i) electric transmission lines (ii) electrical heating devices? Why?

Explanation

To determine which wire is suitable for electrical transmission lines and which is suitable for electrical heating devices, we need to analyze the properties of copper and manganin.

### Step-by-Step Solution:

1. **Understanding Resistance**:
- The resistance \( R \) of a wire is given by the formula:
\[
R = \frac{\rho L}{A}
...