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A hollow dielectric sphere, as shown in ...

A hollow dielectric sphere, as shown in figure, has inner and outer radii of `R_1 and R_2`, respectively. The total charge carried by the sphere is +Q, this charge is uniformly distributed `R_1 and R_2`.

a. the electric field for `rltR_1` is zero. `(Yes//No)`
b. the electric field for `R_1ltrltR_2` is given by ........... .
c. the electric field for `rgtR_2` is given by .......... .

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