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# CBSE Class 10 Answered

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Asked by riyamaths | 30 May, 2018, 07:15: PM
Expert Answer
When the wire is stretched its lengthis increased. But to keep the volume constant, its cross section area decreased.

Let r and l be the initial radius and length of wire.
After stretching the wire to twice its initial length, the radius rnew of new cross section  is given by

Let the initial resistance is R and is given by
......................................(1)
Resistance Rs after stretching the wire is given by
Resistivity is material property. It does not change by stretching the wire
Answered by Thiyagarajan K | 31 May, 2018, 12:54: PM

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