Two wires of equal length, one of copper...

Two wires of equal length, one of copper and the other of manganin, have the same resistance. Which wire is thicker?

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`R_c=rho_c1/a_c` and `R_m=rho_m1/a_mthereforerho_c/a_c=rho_m/a_mthereforea_m/a_c=rho_m/rho_c` or `a_mgta_cbecauserho_mgtrho_c`

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