The problem of divergence produced by using line-model to calculate the tension and coefficient of self-inductance of a circular current loop is discussed.
Because the total self-inductancecoefficient is the sum of all the solenoids? Coefficients, the formulas are not valid in same of opposite directions.
串联后的总自感系数等于各螺线管自感系数之和，所以顺接和反接公式都不成立。
3
The measuring of self-inductancecoefficient by means of direct current bridge method has reduced the difficult and improved the precision of measuring.