A solid metallic sphere has a charge \[+\,3Q\]. Concentric with this sphere is a conducting spherical shell having charge \[-Q\]. The radius of the sphere is \[a\] and that of the spherical shell is \[b(b>a)\]. What is the electric field at a distance \[R(a

\[\frac{4Q}{4\pi {{\varepsilon }_{0}}{{R}^{2}}}\]

\[\frac{Q}{2\pi {{\varepsilon }_{0}}R}\]

\[\frac{3Q}{2\pi {{\varepsilon }_{0}}R}\]

\[\frac{4Q}{4\pi {{\varepsilon }_{0}}{{R}^{2}}}\]

A solid metallic sphere has a charge \[+\,3Q\]. Concentric with this s

1.	A solid metallic sphere has a charge \[+\,3Q\]. Concentric with this sphere is a conducting spherical shell having charge \[-Q\]. The radius of the sphere is \[a\] and that of the spherical shell is \[b(b>a)\]. What is the electric field at a distance \[R(a
A.	\[\frac{Q}{2\pi {{\varepsilon }_{0}}R}\]
B.	\[\frac{3Q}{2\pi {{\varepsilon }_{0}}R}\]
C.	Semiconductor
D.	\[\frac{4Q}{4\pi {{\varepsilon }_{0}}{{R}^{2}}}\]
Answer» D. \[\frac{4Q}{4\pi {{\varepsilon }_{0}}{{R}^{2}}}\]

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A solid metallic sphere has a charge \[+\,3Q\]. Concentric with this sphere is a conducting spherical shell having charge \[-Q\]. The radius of the sphere is \[a\] and that of the spherical shell is \[b(b>a)\]. What is the electric field at a distance \[R(a

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