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R is proportion to l/r^2
therefore R in = I/r^2
here r= 2*l
R= l/(2l)^2
R = l/4×l^2
R = R in /4
R in= 4 *R
therefore R in = I/r^2
here r= 2*l
R= l/(2l)^2
R = l/4×l^2
R = R in /4
R in= 4 *R
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