A Nichrome wire has a radius of 1.3 mm and a resistivity of 1.5 × 10−⁶ Ω⋅m.If the wire carries a current of 1.8 A,what is the potential difference per unit length along this wire? A)0.19 V/m B)0.51 V/m C)0.66 V/m D)6.4 V/m E)5 V/m

Question

Quizplus · Accepted Answer

The potential difference per unit length (V/m) can be calculated using the formula V/L = I * ρ / A, where I is the current, ρ is the resistivity, and A is the cross-sectional area of the wire. The area A = πr², where r is the radius. Substituting the given values, we find V/L = 1.8 A * 1.5 × 10⁻⁶ Ω⋅m / (π * (0.0013 m)²) ≈ 0.51 V/m.

A Nichrome Wire Has a Radius of 1