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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

b

c

d

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

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