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Q.

A point charge +Q is placed at point B at a distance 2R from the center O of an uncharged thin conducting shell of radius R as shown in the figure. lf VA be the potential at point A, which is at a radial distance of R/2 from the center of the shell, then 

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a

VA>Q8πε0R

b

VA=Q8πε0R

c

VA<Q8πε0R

d

VA=0

answer is C.

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Detailed Solution

Since electric field inside the conducting shell is zero, 

V0=VA    and   V0=Q8πε0R

VA=Q8πε0R

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