PHYSICS HELP Electric fields?

Question

What is the resultant electric field at the -8mC charge? What is the force on q3 from this field?

q1= +6mC
q2= +10mC
q3= -8mC
d 1to2= 10cm
d 2to3= 20cm


i have the answer, but i dont understand it, if someone could show me how to do it, id be greatful!

ok here is how it looks
1----------2

3

ah the 3 is like under the two it wont let me type it

Answer 1

What is the geometrical configuration of the problem? I don't see it possible to answer otherwise.

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You need to draw a diagram. q1 is exerting an attractive force on q3. Draw an arrow pointing from q3 pointing towards q1. Same deal for q2 exerting an attarctive force on q3. Draw an arrow from q3 to q2. Now add these two vectors using the rule for vector addition. This is how you get the direction of the force. It will be pointing up and to the left, in between q1 and q2.

Now for the magnetude of the force. Use Coulombs's law for each. You will have to find the distance between q1 and q3 using Pythagorean theorem first. The distance is 10 times square root of 5. Now you can apply Coulombs law for both and just add the results. E-mail me if you need more explanations. I'll check back in 40 min or so.

Answer 2

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