# Consider two concentric spherical surface S1 with radius a and S2 with radius 2a, both centered on the origin….

Q: Consider two concentric spherical surface S1 with radius a and S2 with radius 2a, both centered on the origin. There is a charge +q at the origin, and no other charges. Compare the flux Φ1 through S1 with the flux Φ2 through S2
(a) Φ1 = 4Φ2
(b) Φ1 = 2Φ2
(c) Φ1 = Φ2
(d) Φ1 = Φ2/2
Ans:(c)
$\phi = \frac{q}{\epsilon_0}$

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