Physics, asked by SehajDhanoa, 1 year ago

A copper wire has a diameter 0.5mm and resitivity 1.6 *10^-8ohm m. How much will be the resistance of another copper wire of same length but half the diameter.

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Answers

Answered by choudhurikuntal1969

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Answer:

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

1st image

∴ 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

2nd image

∴ the new resistance is 2.5 Ω

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