Calculating Electric Forces and Fields for Multiple Point Charges

AI Thread Summary
The discussion focuses on calculating the electric forces and fields for four point charges fixed at the corners of a rectangle. The charges are 1.2x10^-3C, and the rectangle measures 30cm by 40cm. The user has begun calculating the forces on one charge, using Coulomb's law and vector addition for the forces acting on it. They seek assistance in determining the forces on each charge and the corresponding angles. The conversation emphasizes the need for clarity in vector calculations and the overall electric field and potential at the center of the rectangle.
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A charge of 1.2x10^-3C is fixed at each corner of a rectangle that is 30cm wide and 40cm long. What is the magnitude and direction of the electric force on each charge? What is the electric field and the electric potential at the centre?

This is the question i am currently trying to solve. This is what i have so far.

sqr(0.3^2+0.4^2) = 0.5
tan(0.3/0.4)= 36.87 degrees

Vector force on q1 upper right:
9*10^9*(1.2*10^-3)^2/(0.3)^2 = 144000 N @90
+
9*10^9*(1.2*10^-3)^2/(0.4)^2 = 81000 N @0
+
9*10^9*(1.2*10^-3)^2/(0.5)^2 = 51840 N @36.87
=

Adding the vectors, i now need to know how to find the forces of each charge and the cooresponding angles. Any help will be appreciated.
 
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