A tungsten wire has resistance R at 20°C. A second tungsten wire at 20°C has twice the length and half the cross-sectional area of the first wire. In terms of R, the resistance of the second wire is
(1) R/2
(2) 2R
(3) R
(4) 4R
+3
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Home » Physics » A tungsten wire has resistance R at 20°C. A second tungsten wire at 20°C has twice the length and half the cross-sectional area of the first wire. In terms of R, the resistance of the second wire is (1) R/2 (2) 2R (3) R (4) 4R