Question Detail
Question
Find the total flux (in N·m²/C) when two charges q1 = 15μC and q2 = -17μC are placed within a spherical surface of radius 20cm.
Correct Answer
Option B is the correct answer.
Detailed Explanation
By Gauss's law, flux depends only on enclosed charge: Φ = Q_enc/ε0 = (15-17)×10⁻⁶/8.85×10⁻¹² ≈ -2.26×10⁵ N·m²/C.
Hint
Only the net enclosed charge matters for Gauss's law — the radius of the sphere is irrelevant.