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电场是一种摸不着、看不到的物质,人们为了研究它,引入电场线,电场线在解题中有着重要的应用。一、根据电场线可以判断电势的高低在电场中沿着电场线的方向是电势降低的方向,由此可以判断电场中各点电势的高低。例1 如图1所示,a、b、c是一条电场线上的三个点,电场线的方向由a到c,a、b间距离等于b、c间距离。用U_a、U_b、U_c、和E_a、E_b、E_c分别表示a、b、c三点的电势和电场强度,
Electric field is an intangible and invisible material. To study it, people introduce electric field lines. Electric field lines have important applications in problem solving. First, according to the electric field line can determine the level of potential in the electric field along the direction of the electric field line is the direction of potential reduction, which can determine the electric field in the various points of the potential level. Example 1 As shown in Figure 1, a, b, and c are three points on a single electric field line. The direction of the electric field lines is from a to c, and the distance between a and b is equal to the distance between b and c. U_a, U_b, U_c, and E_a, E_b, and E_c represent the potentials and electric field strengths at points a, b, and c, respectively.