Question
A conducting sphere of radius 10 cm is charged to 10 μ C. Another uncharged sphere of radius 20 cm is allowed to touch it for some time. After that if the spheres are separated then surface density of charges, on the spheres will be in the ratio of:
Answer: Option C
:
C
After redistribution, new charges on sphere are
Q1=(1010+20)×10=103μC
and Q2=(2010+20)×10=203μC
Ratio of charge densities
σ1σ2=Q1Q2×r22r21=(103203)×(2010)2=21
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:
C
After redistribution, new charges on sphere are
Q1=(1010+20)×10=103μC
and Q2=(2010+20)×10=203μC
Ratio of charge densities
σ1σ2=Q1Q2×r22r21=(103203)×(2010)2=21
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