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Resistance of a copper wire of cross sec...

Resistance of a copper wire of cross sectional area `0.02 cm^(2)` is `5 Omega`. If the resistivity of copper be `1.72xx10^(-6) Omega`- cm then find the length of the wire.

Text Solution

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If the length and area of cross-section of a conductor be l and A respectively, then its resistance `R= rho (l)/(A)`, where `rho` is the resistivity.
`therefore l=(RA)/(rho)=(5xx0.02)/(1.72xx10^(-6)) cm =58139.53 cm=581.4 m`.
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