Find the resistance of copper wire of length 20m and diameter of 5mm. Specific resistance of copper is 1.7 *10-8 Ωm
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Explanation:
R=(specific resistance ×length)÷area
=(1.7×10^-8×20)÷π × (2.5)²× (10^-3)²
=4.3 ×10^-2 ohm
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