Determine the resistance of a copper wire with a length of 100 m and a cross-sectional area of 5 mm.

Task data: l (wire length) = 100 m; S (cross-sectional area of the wire taken) = 5 mm2.

Reference values: ρ (specific electrical resistance of copper at normal conditions) = 0.017 Ohm * mm2 / m.

To determine the resistance of the taken copper wire, we will use the formula: R = ρ * l / S.

Let’s make a calculation: R = 0.017 * 100/5 = 0.34 Ohm.

Answer: The copper wire taken has a resistance of 0.34 ohms.