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Q.

A metal sphere A of radius r1 charged to a potential ϕ1 is enveloped by a thin walled conducting spherical shell B of radius r2 Then ϕ2 of the sphere A after it is connected by a thin conducting wire to the shell B will be :

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a

ϕ1r1r2

b

ϕ1r2r1

c

ϕ11-r2r1

d

ϕ1r1r2r1+r2

answer is A.

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Detailed Solution

ϕ1=KQr1⇒KQ=r1ϕ1All charges moves to outer sphere after connectionϕ2=KQr2=r1r2ϕ1
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