Three copper wires of lengths and cross-sectional areas are (l, A), (2l, A/2) and (l/2, 2A).........

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Q.7--- Three copper wires of lengths and cross-sectional
areas are (l, A), (2l, A/2) and (l/2, 2A). Resistance is
minimum in
(a) wire of cross-sectional area 2A
(b) wire of cross-sectional area A
2
(c) wire of cross-sectional area A
(d) same in all three cases.


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