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copper wire has diameter 0.5mm and Resistivity of what be the length of this wire to make its resistance? How much does the resistance change if diameter is doubled?

Posted by Koralugundi Vasantha 5 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Gaurav Seth 5 years, 4 months ago

Area of cross-section of the wire, A =π (d/2) ²
Diameter= 0.5 mm = 0.0005 m
Resistance, R = 10 Ω
We know that

∴ length of the wire = 122.72m
If the diameter of the wire is doubled, new diameter=2×0.5=1mm=0.001m
Let new resistance be Rʹ

∴ the new resistance is 2.5 Ω

Decrease in resistance = 10 - 2.5

= 7.5 Ω.

0Thank You

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CBSE > Class 10 > Science