PLEASE HELP ME WITH THIS ONE QUESTION
A cylindrical copper wire has a resistance of 10 Ω across a 1-meter length. The resistivity of copper is 1.7 x 10^-8 Ω-m. What is the cross-sectional area of the wire?
Resistance R of a conducting wire of length l and of area of cross section A is given by the expression R = ρ l A
where ρ is resistivity or specific resistance of the material of the conductor. Inserting given values in the expression in SI units we get 34 = ( 1.7 × 10 − 8 ) l π ( 0.1 1000 ) 2 4
