Three copper wires are there with lengths and cross-sectional areas as \( (\ell, \mathrm{A}) ;\l...

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Three copper wires are there with lengths and cross-sectional areas as \( (\ell, \mathrm{A}) ;\left(2 \ell, \frac{\mathrm{A}}{2}\right) \) and \( \left(\frac{\ell}{2}, 2 \mathrm{~A}\right) \). Resistance \( :- \)
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