Question

a wire of length L and resistance R is stretched so that its length is doubled the area of cross section is half how will its 1 resistance change 2 resistivity change justify your answer in each case​

Answer 1

Answer:

Explanation:

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........now go to the link givwn below and u will get the equation..

https://ask.learncbse.in/uploads/db3785/original/2X/0/028e669bd7f2b0e9aca65816e23bacec10c232fe.jpg

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

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