作　　者： ; ; ;

机构地区： 华南理工大学机械与汽车工程学院

出　　处： 《大学物理》 2010年第11期23-25,30,共4页

摘　　要： 电偶极子在绕其中心转动时,正负电荷作加速运动,因此转动的电偶极子会辐射电磁波.利用运动电荷的磁感应强度公式,推导出匀速转动的刚性电偶极子在近场区产生变化磁场的表达式;结合电磁场建立的推迟效应,推导了非相对论情形时、匀速转动电偶极子在远场区的电磁辐射公式,并对比了匀速转动电偶极子辐射与谐振电偶极子辐射的异同. Positive and negative electric charges will undertake accelerated motion when the electric dipole rotates by its center, so the rotational electric dipole will radiate electromagnetic wave. With the formula of magnetic induction intensity produced by electric charge in motion, an expression of variation magnetic field is derived, which is produced by a uniform rotational electric dipole near itself. With the retarding effect of building electromagnetic field, an expression of electromagnetic radiation in far field is also derived for a uniform rotational electric dipole in the non-relative theory. And then comparisons of the similarities and differences in electromagnetic radiation between the uniform rotational electric dipole and the oscillation electric dipole are carried out.

关 键 词： 电偶极子 远场区 推迟效应

领　　域： [理学] [理学]