3R -2Q 4. A solid metal sphere of radius R has charge +2Q. A hollow spherical shell of radius 3R placed concentric with the first sphere has net charge -Q. a) On the diagram below, make a sketch of the electric field lines inside and outside the spheres. b) Use Gauss's law to find an expression for the magnitude of the electric field between the spheres at a distance r from the center of the inner sphere (R
3R -2Q 4. A solid metal sphere of radius R has charge +2Q. A hollow spherical shell of radius 3R placed concentric with the first sphere has net charge -Q. a) On the diagram below, make a sketch of the electric field lines inside and outside the spheres. b) Use Gauss's law to find an expression for the magnitude of the electric field between the spheres at a distance r from the center of the inner sphere (R
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