求解无限长载流直螺线管的磁场是《普通物理学》中的典型问题。本文运用了毕奥萨伐尔定律和安培环路定理两种方法来解析，并进行了多维度的比较，以期提高学生的分析问题和综合解决问题的能力，促进学生元认知能力的发展。%the:analysis of infinite long straight current carrying solenoid magnetic field is a typical problem in General Physics .This paper applies two approches to analyse and make a comparison -- Biot Savart Law and Ampere Circuital Theorem ,so as to improve students'skills of analysis and comprehensive abilty to solve a problem .
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