Question

# A wire of resistivity $$\rho$$ is stretched to double its length what will be its new resistivity?

Solution

## Resistivity is a property of the material which does not depend upon the length or cross-sectional area of the wire.Thus increasing the length will not affect the resistivity of the wire.Hence the new resistivity of the wire will be the same i.e $$\rho$$.$$\textbf{Note:}$$ On changing dimensions, Resistivity does not change but Resistance of the wire changes, as $$R = \cfrac{\rho\ l}{A}$$Physics

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