A given piece of wire of length and radius is having a resistance This wire is stretched uniformly to a wire of radius . What is the new resistance? |
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A given piece of wire of length and radius is having a resistance This wire is stretched uniformly to a wire of radius . What is the new resistance? |
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a) |
b) |
c) |
d) |

1 Answer - 5876 Votes

3537

Resistance of wire given by Also, volume (V)=Length ×Area Where, (r is radius) When the wire is stretched its volume (V) remains constant. Hence, When radius is halved Hence, new resistance increases to sixteen times its original value. |