A conducting sphere of radius 10 cm is charged to 10μC. 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:
A
1:3
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B
3:1
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C
2:1
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D
1:1
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Solution
The correct option is C 2:1 After redistribution, new charges on sphere are Q1=(1010+20)×10=103μC
and Q2=(2010+20)×10=203μC
Ratio of charge densities