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首页> 外文期刊>American journal of physics >SURFACE CHARGES AND ENERGY FLOW IN A RING ROTATING IN A MAGNETIC FIELD
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SURFACE CHARGES AND ENERGY FLOW IN A RING ROTATING IN A MAGNETIC FIELD

机译:磁场中环旋转中的表面电荷和能量流

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摘要

An ohmic ring that rotates with constant angular velocity in an external uniform magnetic field is considered as a simple model for a current generator. Under the assumption that all quantities vary slowly in time, the lowest-order approximation to the surface charge density is found. The flux of the Poynting vector through the loop surface is also computed. Unlike in the examples that are given in textbooks, this flux is not always incoming: It has the outgoing direction around the loop parts where the electrons are moving against electrostatic forces. (C) 1996 American Association of Physics Teachers. [References: 27]
机译:在外部均匀磁场中以恒定角速度旋转的欧姆环被认为是电流发生器的简单模型。在所有量随时间缓慢变化的假设下,找到表面电荷密度的最低阶近似值。还计算了通过回路表面的坡印廷矢量的通量。与教科书中给出的示例不同,该通量并不总是传入的:它具有围绕电子反静电力运动的环路部分的传出方向。 (C)1996年美国物理教师协会。 [参考:27]

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