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In the arrangement shown, a block (of ma...

In the arrangement shown, a block (of mass m) is being moved up against gravity, by two identical balloons, with constant speed v. the balloons carry +Q charge each and the connecting strings are massless. T and B respectively represent tension in each of the connecting strings and buoyant force on each of the balloons. Choose the incorrect alternative.

A

`b=(mg)/2`

B

`2T cos alpha=mg`

C

`T=Q^2/(16piepsilon_0l^2sinalpha)+(mg)/2cosalpha`

D

`2Tsinalpha=Q^2/(16piepsilon_0l^2sin^2alpha)`

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