Expression 9: "V" Subscript, 1 , Baseline left parenthesis, "x" , "y" , right parenthesis equals StartFraction, "k" "q" Subscript, 1 , Baseline Over StartRoot, left parenthesis, "x" minus "x" Subscript, 1 , Baseline , right parenthesis squared plus left parenthesis, "y" minus "y" Subscript, 1 , Baseline , right parenthesis squared , EndRoot , EndFractionV1x,y=kq1x−x12+y−y12
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Expression 10: "V" Subscript, 2 , Baseline left parenthesis, "x" , "y" , right parenthesis equals StartFraction, "k" "q" Subscript, 2 , Baseline Over StartRoot, left parenthesis, "x" minus "x" Subscript, 2 , Baseline , right parenthesis squared plus left parenthesis, "y" minus "y" Subscript, 2 , Baseline , right parenthesis squared , EndRoot , EndFractionV2x,y=kq2x−x22+y−y22
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Expression 11: "k" equals 9 times 10 to the 9th powerk=9·109
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Expression 12: "V" Subscript, 1 , Baseline left parenthesis, "x" , "y" , right parenthesis plus "V" Subscript, 2 , Baseline left parenthesis, "x" , "y" , right parenthesis equals "V"V1x,y+V2x,y=V