Nichrome wire, often used for heating elements, has resistivity of 1.0 × 10-6 ? ? m at room temperature. What length of No. 30 wire (of diameter 0.250 mm) is needed to wind a resistor that has 50 ohms at room temperature?
A) 3.66 m
B) 2.45 m
C) 0.61 m
D) 6.54 m
E) 22.4 m
Answer: B
Physics & Space Science
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