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Question -

A copper wire has diameter 0.5 mm and resistivity of 1.6 × 10–8 Ω m. What will be the length of this



Answer -

wire to make its resistance 10 Ω? How much does the resistance change if the diameter is doubled?


Answer
The resistance of the copper wire of length in meters and area of cross-section m2 is given by the formula
The length of the wire is 122.72 m and the new resistance is 2.5 Ω.

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