The agglomeration of the charged dust particle is investigated by the method of electric-fluid mechanics and the transport theory of external force field.

应用电流体力学和外力场输运理论，分析了电收尘器中带电粉尘粒子的凝并现象。

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The coil is suspended in an external magnetic field and the current running through it adjusted so that the attraction between the two magnets balances the gravitational force on the suspended mass.

ECONOMIST: Weighing a kilogram