The copper wires of elngths and cross-se...

The copper wires of elngths and cross-sectional areas are (l,A), (2l,A/2) and (l/2, 2A). Resistance is minimum in

wire of cross-sectional area A/2

wire of cross-sectional area A

wire of cross-sectional area 2 A

same in all the three cases.

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