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河北省2015年高考物理卷的第15题考察等势面、电场力做功,笔者在下面对其进行解题方面的分析。例1(15题)如下图,直线a、b和c、d是处于匀强电场中的两组平行线,M、N、P、Q是他们的交点,且四点处的电势分别为φ_M、φ_N、φ_P、φ_Q。一电子由M点分别运动到N点和P点的过程中,其电场力所做的负功相等,则()A.直线a位于某一等势面内B.直线c位于某一等势面内C.若电子由M点运动到Q点,电场力做正功
Hebei Province in 2015 the 15th volume of entrance exam physical volume potential, electric field power, I in the following analysis of the problem-solving. Example 1 (15 questions) As shown in the following figure, the straight lines a, b and c, d are two parallel lines in a uniform electric field. M, N, P and Q are their intersections and the potentials at four points are φ_M , Φ_N, φ_P, φ_Q. When an electron moves from point M to point N and point P, respectively, the negative work done by its electric field force is equal, then () A. Line a lies in a certain equipotential surface B. Line c is located at a certain potential Surface C. If the movement of electrons from point M to point Q, the electric field force to do positive work