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A conducting sphere of radius 10 cm is c...

A conducting sphere of radius 10 cm is charged to `10 muC`. 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

`1:4`

B

`1:3`

C

`2:1`

D

`1:1`

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