Determine the amount of work done to move a 12-nC charge against the electric field of a disk of radius 2.5 m and charge density −20-µC/m^2 from ℎ = 2 m to ℎ = 3 m away the disk, along its axis. Answer: 4.0232 mJ Repeat the previous problem, where the electric field is due to a disk, but this time, instead of a disk, consider a ring of same radius and charge density −20-µC/m Answer: 1.9067 mJ

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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.