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A copper of rod (resistivity 2.2 xx 10^(...

A copper of rod (resistivity `2.2 xx 10^(-8) Omega -m) `and an iron (resistivity `1.1 xx 10^(-8) Omega-m)` rod of same length 70 cm each and same diameter 1.4 mm each are joined in series, then the combined resistance is

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