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The electrical forces F e sub start expression 1 2 end expression and F e sub start expression 2 1 end expression are acting on charge q sub 1 and q sub 2 in the opposite direction respectively. R caret sub start expression 1 2 end expression is the unit vector pointing from q sub 1 to q sub 2. An arrow pointing to F e sub start expression 1 2 end expression reads, the force on charge q sub 1 due to charge q sub 2.