A wire of length l and resistance r is stretched so that its length is doubled and the area of cross section is half how will its resistance changes resistivity changes
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l changes to 2l
A to A/2
r proportional to l/A
r' proportional to 2l/ A÷2= 4r
resistance becomes 4 times
and resistivity becomes 1/4 th
A to A/2
r proportional to l/A
r' proportional to 2l/ A÷2= 4r
resistance becomes 4 times
and resistivity becomes 1/4 th
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