What is the cross-sectional area of a tungsten wire through which a current of 0.05 Am

What is the cross-sectional area of a tungsten wire through which a current of 0.05 Am at a voltage of 5 V flows? Wire length 4 meters.

Initial data: I (current value) = 0.05 A; U (effective voltage across the tungsten wire) = 5 V; l (tungsten wire length) = 4 m.

Reference values: ρ (resistivity of tungsten) = 0.055 Ohm * mm2 / m.

1) Determine the resistance of the tungsten wire: R = U / I = 5 / 0.05 = 100 Ohm.

2) Calculate the length of the tungsten wire: R = ρ * l / S and S = ρ * l / R = 0.055 * 4/100 = 0.0022 mm2.

Answer: The cross-sectional area of tungsten wire is 0.0022mm2.