Figure shows a hemisphere of charge Q and radius R and a sphere of charge 2Q and radius R. The total potential energy of hemisphere is UH and that the sphere is US. Then,
A
2UH=US
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B
2UH<US
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C
2UH>US
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D
UH=US
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Solution
The correct option is C2UH<US As both hemispherical sphere and sphere have charge so there are some interaction energy in between them. here, US=2UH+ interaction energy term. Thus, US>2UH.