Test Academy | A hollow disc of aluminum whose external and internal radii are R and r respectively, is floating on the surface of a liquid whose surface tension is T. The maximum weight of disc can be 2π (R+r)T, 2π (R-r)T, 4π (R+r)T, 4π (R-r)T

Question

A hollow disc of aluminum whose external and internal radii are R and r respectively, is floating on the surface of a liquid whose surface tension is T. The maximum weight of disc can be

Options :

2π (R+r)T
2π (R-r)T
4π (R+r)T
4π (R-r)T

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