Three concentric conducting spherical shells have radii r, 2r and 3r and charges q 1 , q 2 and q 3 respectively. Innermost and outermost shells are earthed as shown in the figure. Select the correct alternatives:
Fig.
A
q 1 + q 3 = – q 2
B
q 1 = – 
C
= 3
D
= – 
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a, b, c)
Potential of innermost shell is zero.
or, 
…..(i)
Similarly, potential on outermost shell is also zero.
…..(ii)
Solving equations (i) and (ii), we get
and, 
∴ The options , and are correct.
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