Question

Given the electric flux density, D = 0.3r 2ar nC/m2 in free space: (a) find E at point P(r = 2, θ = 25◦, φ = 90◦); (b) find the total charge within the sphere r = 3; (c) find the total electric flux leaving the sphere r =

Answer 1

for a) E=e_0 D, just sub it in.
b) use Gauss law, \(\nabla \cdot D=Q_{enclosed}\)
c) using Gauss law again, \(\Phi_E = \frac{Q_{enclosed}}{\epsilon_0}\)
do you need further help?