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【单选题】
ZHDY6-2*如图所示,两根导线沿半径方向引向铁环上的A,B两点,并在很远处与电源相连。已知圆环的粗细均匀,电流I,圆环半径R,θ=60°。则环中心O的磁感应强度为()A.
(1)
B.
(2)
C.
(3)
D.
(4)
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