(B) .dfrac ({mu )_(0)I}(2pi R)+dfrac (3{mu )_(0)I}(8R)-|||-(c) dfrac ({mu )_(0)I}(4pi R)-dfrac (3{mu )_(0)I}(8R) (D) dfrac ({mu )_(0)I}(4R)+dfrac ({mu )_(0)I}(2pi R)-|||-<100-|||-21-|||-2-|||-R-|||-(005)-|||-X K-|||-21.18= 小
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