(1999年全国,15)如图10-11所示.A、B、C、D是匀强电场中一正方形的四

(1999年全国,15)如图10-11所示.ABCD是匀强电场中一正方形的四个顶点.已知ABC三点的电势分别为U=15V,U=3V,=-3V.由此可得D点电势U=______ V.

            图10-11

答案

答案: 9

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