A thin, flat ring with inner radius R1 and outer radius R2 is uniformly charged on one side with a surface charge density σ > 0.  Calculate the magnitude of the electric field at P, in newtons per coulomb, for the charged disk described. Use the parameter values of R2 = 0.23 m, σ = 0.24 × 10-4 C/m2, and h = 0.15 m.

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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.