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Questions  

A conducting sphere A of radius ‘a’  with charge Q, is placed concentrically inside a conducting shell  B of radius ‘b’. The sphere B is earthed. ‘C’  is the common center of  A and B. Study the following statements.

i. The potential at a distance r  from  C, where r<a is zero.
ii. The Potential difference between  A and  B is 14πε0Q1a1b
iii. The potential at a distance r from C, where  arb  is 14πε0Q1r1b
Which of the above statements are correct?
 

a
Only (i) and (ii)
b
Only (ii) and (iii)
c
Only (i) and (iii)
d
All

detailed solution

Correct option is B

Charge +Q will flow into earth.∴B will have −Q For a≤r≤bVr=kQr−kQb For r

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