What Must Be the Diameter of a Cylindrical 120-M Long

question 47

Multiple Choice

What must be the diameter of a cylindrical 120-m long metal wire if its resistance is to be ? The resistivity of this metal is 1.68 × 10^-8 Ω • m.

• A) 0.065 mm
• B) 0.65 mm
• C) 0.65 cm
• D) 0.325 mm
• E) 0.0325 mm

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