一个带负电的质点,电量q=-2.0×10-9 C,在静电场中由a点移到b点,

一个带负电的质点,电量q=-2.0×109 C,在静电场中由a点移到b点,在这过程中,除电场力外,其他力作的功为6.0×105 J,质点的动能增加了9.0×105 J,则a、b两点间的电势差Φab            V。

答案

-1.5×104

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