Electrostatics Question 230

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 [MP PMT 1995]

Options:

A) Q2πε0R

B) 3Q2πε0R

C) 3Q4πε0R2

D) 4Q4πε0R2

Show Answer

Answer:

Correct Answer: C

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 =14πε0.3QR2



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