Posted by **sara** on Friday, August 17, 2012 at 8:28pm.

3 charges sit on vertical equilateral triangle the side of each is 30.0 cm. if the triangle are A= +4.0 uC B=+5.0 uC and C=+6.0 uC (clockwise from top) what is the force on each charge?

- physic -
**bobpursley**, Friday, August 17, 2012 at 8:47pm
Look at the top. distance to each charge is .3 m. I assume you want the magnitude of the force, not direction.

I will do A.

ForceonA=forcefromB+force from C.

Draw the duagran, Label the forces B, and C. Move force C to the end of A (as in adding verctors, the resultant is R

Law of cosines:

R^2=B^2+C^2-2BCcostheta.

with some figuring, you see the angle between B, C is 120. So the internal angle in the parallelogram is then 60 deg.

So what is B? k4mC*5mC/.3^2

What is C? k4mC*6mC/.3^2

There you go, solve it.

## Answer This Question

## Related Questions

- Physics - 3 charges sit on vertical equilateral triangle the side of each is 30....
- physics - Three charges sit on the vertices of an equilateral triangle, the side...
- General Physics II - ___A __/__\ B/____\C radius (each side of this equilateral ...
- physics - the side of an equilateral triangle is 20 cm identical charges of 1.5x...
- Algebra - The perimeter of an equilateral triangle is 7 in. more than the ...
- geometry - An equilateral triangle has a side of 8. If one corner of the ...
- physics - Three equal positive point charges q are at the corners of an ...
- physics - Three equal charges are placed at the corners of an equilateral ...
- Physics HELP!! - Three point charges have equal magnitudes, two being positive ...
- Physics E&M - Three electrons form an equilateral triangle 1.00 nm on each side...

More Related Questions