- #1
duki
- 264
- 0
Problem:
A charge of +18 uC is on the y-axis at y = +3.0m. A charge of -12 uC is at the origin. Last, a charge of +45 uC is on the x-axis at x = +3.0m. Determine the magnitude and direction of the net electrostatic force on the charge at x = +3.0mm. Specify the direction relative to the -x axis.
So what I have drawn is:
O-> 18 x (10)^-6
|
|
| /\
| 3.0m
| \/
|
|
|
|
| Origin Charge: -12x10^-6
|O_ _ _ _ _ _ _ _ _ _ _ O -> 45 x (10)^-6
< 3.om >
So I did:
F1 = (8.99 x 10^9)(12 x 10^-6)(18 x 10^-6) / 9 = 1.942 N
F2 = (8.99 x 10^9)(12 x 10^-6)(45 x 10^-6) / 9 = 0.539 N
Can I use trig to determine the magnitude now? I tried it but I got this:
1.942cos90 = 0
1.942sin90 = 1
Surely I've messed up somewhere. Can someone point me in the right direction?
Thanks a bunch!
A charge of +18 uC is on the y-axis at y = +3.0m. A charge of -12 uC is at the origin. Last, a charge of +45 uC is on the x-axis at x = +3.0m. Determine the magnitude and direction of the net electrostatic force on the charge at x = +3.0mm. Specify the direction relative to the -x axis.
So what I have drawn is:
O-> 18 x (10)^-6
|
|
| /\
| 3.0m
| \/
|
|
|
|
| Origin Charge: -12x10^-6
|O_ _ _ _ _ _ _ _ _ _ _ O -> 45 x (10)^-6
< 3.om >
So I did:
F1 = (8.99 x 10^9)(12 x 10^-6)(18 x 10^-6) / 9 = 1.942 N
F2 = (8.99 x 10^9)(12 x 10^-6)(45 x 10^-6) / 9 = 0.539 N
Can I use trig to determine the magnitude now? I tried it but I got this:
1.942cos90 = 0
1.942sin90 = 1
Surely I've messed up somewhere. Can someone point me in the right direction?
Thanks a bunch!