A charged particle is suspended at the center of two thin concentric spherical charged shells, m...

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A charged particle is suspended at the center of two thin concentric spherical charged shells, made of nonconducting material. Figure (a) shows cross section of the arrangement. Figure (b) gives the net flux \( \phi \) through a Gaussian sphere centered on the particle, as a function of the radius \( r \) of the sphere.
What is the charge on the central particle?
(1) \( 0.2 \mu \mathrm{C} \)
(2) \( 2 \mu \mathrm{C} \)
(3) \( 1.77 \mu \mathrm{C} \)
(4) \( 3.4 \mu \mathrm{C} \)
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