find the answer plzz
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We know that,
R = pL/A
where, p is the resistivity
L is the length
A is the area of cross-section
then,
R is directly proportional to length
R1/R2 = L1/L2
20/30 = 1/L2
L2 = 3/2 = 1.5m
Therefore, 1.5m of the conductor can give 30ohm resistance
Hope this is helpful to you
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