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A copper wire has diameter 0.5 mm and resistivity of 1.6 x 10^-8 ‎Ωm. What will be the length of this wire

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asked Jan 22, 2018 in Physics by Kundan kumar (49,132 points) ● 35 ● 441 ● 1433

A copper wire has diameter 0.5 mm and resistivity of 1.6 x 10 -8  ‎Ωm. What will be the length of this wire to make its resistance 10 ‎Ω. How much does the resistance change if the diameter is doubled?

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answered Jan 22, 2018 by Vikash Kumar (144,729 points) ● 8 ● 11 ● 26
selected Jan 23, 2018 by Kundan kumar
 
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Thus, on doubling the diameter, the area of cross-section becomes 4 times and the resistance becomes one-fourth.

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