An engineer uses a digital micrometer to measure the diameter of a core copper conductor in a high-voltage power cable.
The micrometer has a zero error of +0.06 mm. The digital display shows a measured diameter of 3.68 mm.
What is the correct cross-sectional area of the conductor?
1.03×10−5 m21.03 \times 10^{-5}\text{ m}^21.03×10−5 m2
1.10×10−5 m21.10 \times 10^{-5}\text{ m}^21.10×10−5 m2
4.12×10−5 m24.12 \times 10^{-5}\text{ m}^24.12×10−5 m2
4.39×10−5 m24.39 \times 10^{-5}\text{ m}^24.39×10−5 m2
