In a certain region of the space the electric field at a point whose position vector is 7 is given by E(r)=, where a = 180 Nm/C.

Question

In a certain region of the space the electric field at a point whose position vector is 7 is given by E(r)=, where a = 180 Nm/C. How much electric charge in nC is enclosed inside a sphere of radius R = 0.5 m centered at origin?

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