- #1
chemboy
- 18
- 0
3 electrons q1, q2, q3 setup in a right angled triangle
q1
|\
| \
q3-q2
charges are
q1 = +2.5 X 10^-17C
q2 = +3.0 X 10^-17C
q3 = +3.5 X 10^-17C
distances between the charges
q1-q3 = .03 m
q1-q2 = .05 m
setup FBD
\
\ 2F1
\
/
/ 3F1
q1
2F1 = k*q1*q2 / .05^2
= 2.7 X 10^-21N
3F1 = k*q3*q1 / .03^2
= 8.75 X 10^-21N
now I think I use cosine law to figure this out
Fnet = sqrt(2F1^2 + 3F1^2 - 2(2F1)(3F1)cos135)
= 7.1 X 10^-21
with all charges being positive, all qs are experiencing repulsion so the direction is away from q1
the question "calculate the magnitude and direction of force on q1"
q1
|\
| \
q3-q2
charges are
q1 = +2.5 X 10^-17C
q2 = +3.0 X 10^-17C
q3 = +3.5 X 10^-17C
distances between the charges
q1-q3 = .03 m
q1-q2 = .05 m
setup FBD
\
\ 2F1
\
/
/ 3F1
q1
2F1 = k*q1*q2 / .05^2
= 2.7 X 10^-21N
3F1 = k*q3*q1 / .03^2
= 8.75 X 10^-21N
now I think I use cosine law to figure this out
Fnet = sqrt(2F1^2 + 3F1^2 - 2(2F1)(3F1)cos135)
= 7.1 X 10^-21
with all charges being positive, all qs are experiencing repulsion so the direction is away from q1
the question "calculate the magnitude and direction of force on q1"