Data : σ1 = 5 × 10-6 C / m2 ,
σ2 = -2 × 10-6 C/m2,
r1 = 2 × 10-2 m,
r2 = 2 × 10-2 m
ε0 = 8.85 × 10-12F/m
Surface charge density, σ = \(\cfrac QA\) = \(\cfrac Q{4πr^
2}\)
∴ The charges on the metal spheres are
∴ By Gauss’s theorem, the net flux through the surface