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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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a

Q2πε0R

b

3Q2πε0R

c

3Q4πε0R2

d

4Q4πε0R2

answer is C.

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Detailed Solution

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=E=3Q4πε0R2

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