A thin rod is bent into a circular arc that subtends an angle 2θ of a circle centered at P. A total charge, Q, is distributed uniformly over the full rod. Let the positive x direction be towards the right of the page, and the positive y direction is towards the top of the page. In Cartesian unit-vector format, what is the electric field at P?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.