Drill problems [1]: D3.3. Given the electric flux density, D = 0.3r²a, nC/m2 in free space: (a) find E at point P(r = 2, 0 = 25°, = 90°); (b) find the total charge within the sphere r = 3; (c) find the total electric flux leaving the sphere r = 4. Ans. 135.5a, V/m; 305 nC; 965 nC

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Coulomb’s Law

Coulomb's law states that the attraction or repulsion force between two charged things is proportional to the product of their charges and inversely proportional to the square of their distance. It has an effect along the line that connects the two-point charges.