8.Three concentric spherical shells have radii a, b, and c(a < b < c) and have surface charge densities , and respectively. If VA, VB and VC denote the potentials of the three shells, then, for c = a + b, we have : (1) VC = VB = VA (2) VC = VA ≠ VB (3) VC = VB ≠ VA (4) VC ≠ VB ≠ VA

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