A wire is stretched so as to change its diameter by 0.25%. The percentage change in resistance is |
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a) |
4.0% |
b) |
2.0% |
c) |
1.0% |
d) |
0.5% |

A wire is stretched so as to change its diameter by 0.25%. The percentage change in resistance is |
|||||||

a) |
4.0% |
b) |
2.0% |
c) |
1.0% |
d) |
0.5% |

1 Answer

127 votes

On stretching, volume ( ) remains constant. So Now, Taking logarithm of both the side and differentiating it we get |

127 votes

127