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For a wire, its twisting couple per unit angular twist is given by
C = 1 2 π a 2 η l
C = 1 2 π a 2 η 2 l 2
C = 1 2 π a 2 η 2 l
C = 1 2 π a 4 η l
C =12π a4 ηl
Quick Summary: Practice and solve "For a wire, its twisting couple per unit angular twist is given by..." for Electrical - Electrical Materials. The correct answer is Option D: C =12π a4 ηl. Detailed step-by-step solution, conceptual clarity, and formulas on Examoogle.
Answer:
Option **(d) **