Question

calculate the resistance of 50m length of wire of cross sectional area 0.01 square mm and of resistivity 5*10 to the power minus 8

Answer 1

$Resistance R = resistivity * length / area R = 5 10^{-8} * 50 m / 0.01 * 10^{-3} * 10^{-3} R = 250 Ohms$