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
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 :