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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.
In which range of the values of \( r \) is the electric field zero?
(1) 0 to \( r_{A} \)
(2) \( r_{A} \) to \( r_{B} \)
(3) for \( rr_{B} \)
(4) for no range of \( r \), electric field is zero
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