补偿型扭称中的电流环设计

The Design of the Current Rings in a Compensated Torsion Balance

在补偿型卡文迪许扭称实验中，两电流环之间的安培力已被用于平衡吸引质量与检验质量之间的万有引力。为了合理设计电流环，给出了两共轴电流环之间安培力的解析表达式，根据这一表达式和数值计算，可证明两不同直径的电流环之间的安培力具有极值点，从而可大大地降低对圆环间距测量精度的要求。这对于精确测量万有引力常数具有重要意义。

he Ampere force between the current rings has been used to balance the gravitationalforce between the attracting mass and test mass in a compensated Cavendish balance, For arational design of the current rings,an analytic expression for the Ampere force between twocoaxial current rings has been derived. On the basis of this expression and numerical calcula-tion, it is proved that the Ampere force between two rings of different diameters has a maxi-mum value,which would greatly lower the requirement on the measuring accuracy of the dis-tance between current rings, It is of considerable significance lor the accurate measurementof gravitational constant G.