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Physics
Physics
Problem
A copper wire of length 80 cm and cross-sectional area
0.20
mm
2
0.20\,\text{mm}^2
0.20
mm
2
has resistance
R
R
R
. Which length of copper wire of cross-sectional area
0.40
mm
2
0.40\,\text{mm}^2
0.40
mm
2
has resistance
R
R
R
? A) 10 cm B) 20 cm C) 40 cm D) 160 cm
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