Use the Following Figure to Answer the Next Problem $\pi\varepsilon$ ₀)^-1?
A)kQ/r²
B)2kQ/r²
C)kQ/a²
D)kQ/b²
E)kQ/(b

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 a < r < b,is which of the following,in terms of k = (4 $\pi\varepsilon$ ₀) ^-1?

A) kQ/r²
B) 2kQ/r²
C) kQ/a²
D) kQ/b²
E) kQ/(b - a) ²