Use the Following Figure to Answer the Next Problem $\pi\varepsilon$ ₀)^-1?
A)kQ/r²
B)kQr/a³
C)kQ/a²
D)kQ/b²
E)zero

Multiple Choice

Use the following figure to answer the next problem:
-A solid sphere of radius a is concentric with a hollow sphere of radius b,where b > a.If the solid sphere has a charge +Q and the hollow sphere a charge of -Q,the electric field at radius r,where r < a,is which of the following,in terms of k = (4 $\pi\varepsilon$ ₀) ^-1?

A) kQ/r²
B) kQr/a³
C) kQ/a²
D) kQ/b²
E) zero