Two concentric, thin metallic spherical shells of radii R1andR2(R1>R2)bear charges Q1andQ2respectively. Then the potential at radius ‘r’ between R1 and R2will be 14πϵ0times
A
Q1+Q2r
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B
Q1R1+Q2r
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C
Q1R1+Q2R2
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D
Q1R2+Q2R2
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Solution
The correct option is BQ1R1+Q2r The potential at radius r between R1 and R2= potential inside the shell of radius R1+ potential outside the shell of radius R2 or Vr=Q14πϵ0R1+Q24πϵ0r as (Vin=Vsurface) for shell or Vr=14πϵ0[Q1R1+Q2r]