a uniform wire of length l and radius r has resistance 100 ohm. it is recast into a thin wire of (1) length 2l (2) radius r/2. calculate the resistance of new wire in each case
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previous resistance =R=£L/A
where £=resistivity and A =¥r^2
new resistance =R'=£(2L)/¥(r/2)^2=8R =8.100=800ohm
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where £=resistivity and A =¥r^2
new resistance =R'=£(2L)/¥(r/2)^2=8R =8.100=800ohm
hope this will help you
you can follow me and mark as brainliest to get answer thoroughly
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