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Q.

Two concentric spherical conducting shells of radii R and 2R carry charges Q and 2Q respectively. Change in electric potential on the outer shell when both are connected by a conducting wire is k=14πε0

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a

zero

b

3 KQ2R

c

kQR

d

2KQR

answer is A.

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Detailed Solution

sbefore joining the potential of the outer sphere is KQ2R+2Q2R = K3Q2R after joining all the charges will go to outer sphere and it's potential will be  K3Q2R  SO NO CHANGE IN POTENTIAL
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Two concentric spherical conducting shells of radii R and 2R carry charges Q and 2Q respectively. Change in electric potential on the outer shell when both are connected by a conducting wire is k=14πε0