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Q.

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.

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a

Q2πε0R2

b

3Q2πε0R2

c

3Q4πε0R2

d

4Q2πε0R2

answer is C.

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Detailed Solution

The electric field is due to shell is zero But due to solids sphere
 

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=14πεo3qR2

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