What length of copper wire of specific resistance `1.7 xx 10^(-8) Omega ` m and radius 1 mm is required so that its resistance is 1` Omega ` ?

Explanation

To find the length of copper wire required for a resistance of 1 ohm, we can use the formula for resistance:

\[ R = \frac{\rho \cdot L}{A} \]

where:
- \( R \) is the resistance,
- \( \rho \) is the specific resistance,
- \( L \) is the length of the wire,
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