2.1 A circular portion is cut from a nonconducting disk of radius R₂ = 15.0 cm, with radius R₁ = 4.0 cm measured from the origin of coordinates. The resulting disk, presented in the figure, is loaded its surface with +3Q uniformly, with Q = 4.3 pc. R₂ R₁ I a) Determine the value of the surface charge density of the disk in the figure. b) What is the value of the electric potential generated by the disk at point A, located 20.0 cm from the origin of the coordinate system? c) If an object charged (considered as a point charge) with -1.8 µC is placed on the point A and moves to point B, located 24.0 cm from the origin of the system of coordinates, what is the minimum work required to move the charged object from A to B?

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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.