A disk of radius R is sprayed with a charged paint so that the resulting charge density varies continually with radial distance, r, from the center of the disc according to σ = σ0 r/R Observation point P is located on the symmetry axis at a distance hℎ above the plane of the disc, as shown.   If R=5.65 cm, h=10.97 cm and σ0=7.03 nC/m2, then what is the potential, in volts, at observation point 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.