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A conductor is composed of seven identical copper strands, each having a radius 'R'. Then what is self GMD (Geometric Mean Distance) of the conductor? 

(A) 2.645 R (B) 2.177 R (C) 2.141 R (D) 1.21 R 
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2 Answers

b
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Self GMD of the seven strand conductor is 49th root of the distances. Thus
Ds = [(r')7 × (D²12 × D²26 × D14 × D17)6 × (2)6]1/49
= [(0.7788 r)7 × (2²r² × 3 × 2²r² × 2²r × 2r)6]1/49

=
2r[3(0.7788)]1/7
2.177 r
61/49


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