Resistance in a wire

Specific resistance of a wire can be measured by the formula

• R/L

• RA/L

• RL/A

• A/RL

SI unit of the conductivity of the material is

• Ω m

• Ω

• Ω^-1 m

• Ω^-1 m ^-1

All of the following wires are made of the same material but are different sizes. Identify the wire withthe lowest resistance.

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Which of the following aluminum wires would have the greatest resistance?

• 3 cm in length and 2 cm in diameter

• 6 cm in length and 2 cm in diameter

• 9 cm in length and 2 cm in diameter

• 12 cm in length and 2 cm in diameter