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A resistance of 2Ω is to be made from a copper wire (specific resistance $1.7 × 10^{-8}Ω m$) using a wire of length 50 cm. The radius of the wire is |
0.0116 mm 0.0367 mm 0.116 mm 0.367 mm |
0.0367 mm |
$R = \frac{\rho l}{A}$ $ A = \frac{\rho l}{R} = \frac{1.7\times 10^{-8}\times 0.5}{2} = \pi r^2$ $\Rightarrow r = 0.0367mm$ |
