What is the diameter of a 1.00-m length of tungsten wire whose resistance is 0.32 ohms?

Answer: The Diameter = 4.72 * 10^-4 metre = 0.000472m

Explanation:

Length of the tungsten wire = (L) 1.00m

Resistance of the tungsten wire (R) = 0.32ohms

Diameter (D) = ?

Resistivity (p) which is a constant = 5.6 * 10^-8

Pie (π) = 3.14

Now Using the formula

resistance = (resistivity * length) / area

R = pL / A

R = pL / πr²

R = pL / π (D/2) ²

D² = 4pL / πR

D = √{ (4pL) / (πR) }

D = √{ (4 * 5.6 * 10^-8 * 1.0) / (3.14 * 0.32) }

D = 4.72 * 10^-4 metre = 0.000472 m