库仑定律是电磁现象的基本规律。它也和其它物理规律一样,有其适用条件。在教学中搞清这一点,对于学员正确理解和运用这一定律是很有必要的。电磁学中,库仑定律(?)的适用条件一般提法是:“真空中,两个静止的点电荷”。“点电荷”这一条件任何情况下都是必要的,否则库仑定律就不成立。在相对介电常数为ε_r 的电介质中,场源 Q 在距其r 处激发的电场为:(?),检验电荷 q 在该处受到的库仑力为(?),是真空中受力的(?)。也就 Coulomb’s law is the basic law of electromagnetic phenomena. It also has the same conditions as other laws of physics. To clarify this point in teaching is very necessary for students to correctly understand and apply this law. In electromagnetics, the general formulation of the applicable conditions of Coulomb’s law (?) Is: “Two static point charges in a vacuum.” The “point charge” condition is necessary under all circumstances, otherwise Coulomb’s law does not hold. In a dielectric with a relative dielectric constant ε_r, the electric field excited by the field source Q at its distance r is (?) And the Coulomb force (?) At which the test charge q is subjected is? ?). That’s it