偶极子在它的轴的方向上不发射能量。
The dipole does not radiate energy in the direction of its axis .
偶极子在它的轴的方向上不发射能量。
The dipole does not radiate energy in the direction of its axis.
讨论了偶极子在一般外场中的能量及受力问题，并分析了其受力性质。
The force on a dipole and its energy in an external field is discussed, and the properties of the force are analyzed.
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