A Solid Sphere of Radius a Is Concentric with a Hollow

question 65

Multiple Choice

A solid sphere of radius a is concentric with a hollow sphere of radius b, where b > a. If the solid sphere has a uniform charge distribution totaling +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$$\isin$ ₀) ^-1?

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

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