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STD 12 - 1. Electric charges and fields — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 1. Electric charges and fields4 Marks
Question
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 $R(a < R < b)$ from the centre
✓

Answer

(c) Electric field at a distance $R$ is only due to sphere because electric field due to shell inside it is always zero. Hence electric field =$\frac{1}{{4\pi {\varepsilon _0}}}.\frac{{3Q}}{{{R^2}}}$

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