Answer:
R = 2π×10⁻⁶ L / A
Step-by-step explanation:
Resistance varies directly with length and inversely with area, so:
R = kL/A
A round wire has cross-sectional area of:
A = πr²
Substituting:
R = kL/(πr²)
Given that R = 0.025 Ω when L = 500 cm and r = 0.2 cm:
0.025 = k (500) / (π (0.2²))
k = 2π×10⁻⁶
Therefore:
R = 2π×10⁻⁶ L / A
Answer:
0.00002 in the first blank. in the second blank its A
Step-by-step explanation:
