Point Charges: Finding Force on Q_2 - Solved Homework Problem

[pat666]

Homework Statement

The four point charges, each of + 3.00 μC, are situated at the corners of a rectangle of length, b = 60.0 cm and width, a = 30.0 cm.

Find the magnitude and direction of the force on q2, due to the other charges.
Solved this but i needed someone to check it for me because its worth marks.

Homework Equations

The Attempt at a Solution

The force on Q_2 is 1.05N and the direction is 68.5 degrees

 

[graphene]

i am not sure if anyone would work out the calculations and verify the result.
but if you show all your calculations, someone might check them.

this problem is pretty simple vector addition & you've got to be sure about your calculations.

 

[pat666]

Hey graphene sorry I meant to put my procedure in... basically there is one force in the i direction and 1 in the j - both from a 3 uC charge. The one that is slightly difficult (not really but compared to the others) is the one that sits on the opposite corner and affects both the i and j cmpts. For this I found the radius using p's theorem and then found the force - then I split that up by Fcos(theta)i+Fsin(theta)j. then I added the i and j cmpts and resolved again. can you please tell me if this is right? thanks

 

[graphene]

yes, that's the way to do it.

 

[pat666]

thanks graphene