Question

Why is the charge on the outer surface of the outermost shell neutral?

Answer 1

@phi

Answer 2

Oh I forgot to add some info haha

Answer 3

a charge of +Q is placed on the outermost shell
a charge of -Q is placed on the solid innermost sphere

Answer 4

and the question is:
What will be the charge on the outer surface of the outermost shell?

Answer 5

and the answer is 0

Answer 6

Try using Gauss's Law

Answer 7

\[\phi_{net}=E\cdot A=\frac{Q_{inside}}{\epsilon_0}\]