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Question

Spherical cavity of spherical conductor has point A inside conductor at distance r from charge Q & point B is also inside conductor at distance 2r from charge Q, then

A
VA:VB=2:1
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B
VA:VB=1:2
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C
VA:VB=4:1
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D
VA:VB=1:1
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Solution

The correct option is D VA:VB=1:1
E inside conductor =0 (in static condition)
ΔV=E.Δr=0(Δr)=0
VA=VB

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