What is the correct answer?
4
A. (μπ²N/60t) × (R₁ - R₂)
B. (μπ²N/60t) × (R₁² - R₂²)
C. (μπ²N/60t) × (R₁³ - R₂³)
D. (μπ²N/60t) × (R₁⁴ - R₂⁴)
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