There is a thick-walled metal ball , with Qtotal=0 on it , but a negative charge

Question

There is a thick-walled metal ball , with Qtotal=0 on it , but a negative charge -Q suspended inside , below center.
How are the ("absolute", relative to infinity) Electric Potentials at the inner surface and at the outer surface related?

a. V(inner) is more negative, especially at bottom.
b. V(inner) is more negative, especially at top.
c. V(inner) = V(outer) , both = 0[V]
d. V(inner) = V(outer) , but more than 0[V]
e. V(inner) = V(outer) , but less than 0[V]
f. V(outer) is more negative, especially at bottom.

Explanation / Answer

Potential on the surface of the spherical shell V = Kq / R Where q = net charge inside the shell             R = radius of the shell Potential inside the shell V = Kq / R So,  V(inner) = V(outer) , but less than 0[V]
Since the inside the charge is negative.So, V is less than zero

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