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笔者认为在电磁场教学中对静电力的计算有必要强调以下几点,以引起学生的注意。(1)应用定义式F=qE求静电力时,这里的E不包括q的贡献。(1)虚功原理不能用于求体电荷分布的静电力。对于注记(1)是不言而喻的,这是由库仑定律本身决定的。本文将通过实例着重论述注记(2)。
I believe that in the teaching of electromagnetic field on the calculation of electrostatic power it is necessary to emphasize the following points to arouse the students’ attention. (1) Applying the definitive formula F = qE for electrostatic forces, here E does not include the contribution of q. (1) The principle of virtual work can not be used to find the electrostatic charge distribution of the body. It is self-evident for annotation (1), which is dictated by Coulomb’s law itself. This article will focus on examples by annotation (2).