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Physics please help

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What is the potential halfway between two point charges spaced 1 mm apart if q1=10 micro coulombs and q2= -5 micro coulombs?

Attempt at solution:
no idea but need to get this right our homework is graded

  • Physics please help -

    distance to each charge is .0005m

    Voltage is scalar, so they add.

    V=k(10micro/.0005 -5micro/.0005)=k*5micro/.0005

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