A charge of (50 mathrm{nC}) is located at the center of a hollow sphere of radius (10

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A charge of \(50 \mathrm{nC}\) is located at the center of a hollow sphere of radius \(10 \mathrm{~cm}\). For what radius of the sphere will the electric field line density over the surface be:

(a) doubled 

(b) halved?

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