(08静电场)9 点电荷的电势表达式应用(原卷)
【拓展:点电荷的电势表达式应用】1、如图所示,真空中三点、、在平面直角坐标系中的坐标分别为、、。已知真空中到正点电荷距离为处的电势为,式中为静电力常量。若在坐标原点固定一正点电荷,则下列说法正确的是( )A.三点、、的电场强度大小之比为25:16:9B.三点、、的电势之比为5:4:3C.正检验电荷在点受到的库仑力与在点受到的库仑力大小之比为16:9D.将正检验电荷由点沿直线移动到点的过程中,电场力做功为2、如图所示,在真空中有三个带等电荷量的点电荷a、b和c,分别固定在水平面内正三角形的顶点上,其中a、b带正电,c带负电,0为三角形中心,A、B、C为三条边的中点.则A.B、C两点场强相同B....
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