A thick wire is stretched, so that its length become two times. Assuming that there is no change in its density, then what is the ratio of change in resistance of wire to the initial resistance of wire? |
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a) |
2 : 1 |
b) |
4 : 1 |
c) |
3 : 1 |
d) |
1 : 4 |

A thick wire is stretched, so that its length become two times. Assuming that there is no change in its density, then what is the ratio of change in resistance of wire to the initial resistance of wire? |
|||||||

a) |
2 : 1 |
b) |
4 : 1 |
c) |
3 : 1 |
d) |
1 : 4 |

1 Answer

127 votes

Resistance of the wire is given by So, (if density remains same) Hence, change in resistance =4R-R=3R |

127 votes

127