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A wire is 10 m long, has a cross-sectional area of 1 cm², and is made of a mater

1. A wire is 10 m long, has a cross-sectional area of 1 cm², and is made of a material with resistivity 100 Ω·m. What is its resistance, in mega-ohms?

 

Resistance equals ρL/A. Converting 1 cm² to 1×10⁻⁴ m² and computing (100 × 10) ÷ (1×10⁻⁴) gives 10,000,000 Ω, which is 10 mega-ohms.

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