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在历届全国中学生物理竞赛中,涉及电场强度和电势的计算,或间接求解场强和电势的试题时有出现。如何指导学生对这类问题的分析与求解,笔者认为关键是抓住两点:1 正确理解和掌握有关场强和电势的基本规律点电荷的场强公式E=kQ/r~2,电势公式U=kQ/r。对于半径为R的均匀带电球壳有
In previous nationwide physics competitions for middle school students, calculations involving electric field strength and electric potential, or indirect solutions to field strengths and electric potentials have emerged. How to guide students to analyze and solve such problems, the author believes that the key is to grasp two points: 1 correctly understand and master the basic laws of field strength and potential point charge field strength formula E=kQ/r~2, potential formula U=kQ/r. For a uniformly charged spherical shell with a radius of R