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A wire of lenth l and …

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A wire of lenth l and resistance r is streatched so that its lenth is double and area of cross section is halved. How will its. 1)resistance change 2) resistivity change

Posted by ? ... 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Gaurav Seth 6 years, 3 months ago

Answer:

Here, length is doubled and area of cross-section is halved. Thus, a wire of length l and area of cross-section A becomes a wire of length 2l and area of cross-section A/2

i.e., resistance becomes four times
Resistivity of a substance does not depend on its length or area of cross-section. It depends on the nature of the material and temperature. Hence there is no change

2Thank You

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