A spherically symmetric charge distribution produces the electric field E = (5000r 2 )r N/C, where r

Question:

A spherically symmetric charge distribution produces the electric field E = (5000r²)r̂ N/C, where r is in m.
a. What is the electric field strength at r = 20 cm?
b. What is the electric flux through a 40-cm-diameter spherical surface that is concentric with the charge distribution?
c. How much charge is inside this 40-cm-diameter spherical surface?

Distribution
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