Question: Q. 3. A small metallic sphere carrying charge +Q is located at the centre of a spherical cavity in a large uncharged metallic spherical shell. Write the charges on the inner and outer surfaces of the shell. Write the expression for the electric field at the point P1.R [Comptt. Delhi I, II, III 2014]

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Solution:

Ans. Charge on inner surface : Q

Charge on outer surface : +Q

Electric field at point P1

(1)E=14πε0Qr12

[CBSE Marking Scheme, 2014]



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