大学物理 磁学 英文题目 在线等A thin, infinitely large sheet lying in the yz plane carries a current of linear current density Js. The current is in the y direction, and Js represents the current per unit length measured along the z axis

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大学物理 磁学 英文题目 在线等A thin, infinitely large sheet lying in the yz plane carries a current of linear  current density Js. The current is in the y direction, and Js represents the current per unit length measured along the z axis
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大学物理 磁学 英文题目 在线等A thin, infinitely large sheet lying in the yz plane carries a current of linear current density Js. The current is in the y direction, and Js represents the current per unit length measured along the z axis
大学物理 磁学 英文题目 在线等

A thin, infinitely large sheet lying in the yz plane carries a current of linear  current density Js. The current is in the y direction, and Js represents the current per unit length measured along the z axis. Find the magnetic field near the sheet.

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大学物理 磁学 英文题目 在线等A thin, infinitely large sheet lying in the yz plane carries a current of linear current density Js. The current is in the y direction, and Js represents the current per unit length measured along the z axis
因为这是一个无限长的薄板,具有对称性,可以用磁场的安培环路定理解.
蓝色的虚线就是合适的环路.由于B的方向垂直于环路的宽度,所以积分为零.
有:原式=2LB,环路包围的电流为LJs
所以:2BL=(μ0)LJs (0是下标),B==(μ0)Js/2