Electric force of attraction between forces.

AI Thread Summary
The discussion centers on calculating the electric force of attraction between charges of 3 C and -10 C separated by 5 m using the formula F = k x (Q x q / r^2). The initial calculation appears incorrect due to a missing constant k in the equation. After clarification, the correct calculation yields a force of approximately 1.08 E10 N. Participants confirm that the final result is accurate despite initial confusion. The conversation highlights the importance of including all constants in physics calculations.
astru025
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Problem:
What is the electric force of attraction between charges of 3 C and -10 C separated by a distance of 5 m?

Equation: F= k x (Q x q / r^2)
3 x -10 / 5^2 = -1.2 x 8.99E9 = 1.08 E10 N.

Using this equation and the answer I found, I still am getting the wrong answer. Not sure what I am doing wrong but any help would be nice!
 
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Your calculation does not make sense.
3x(-10)/5^2 does not give that number you show there.
You forgot to include k?
The final result looks OK.
 
So 1.08 E10 is the right answer?
 

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