Answer :

Here, we need to take into the fact that the air filled balloon is immersed in “air”. Thus, a force of buoyancy will act on the balloon which will make the weight of the air filled balloon always less than the actual weight, W2 < W1 + ω.

As it is completely immersed and the densities of air are equal, the buoyant force of air will be equal to the weight of the air. This means, W2 = W1 + ω - ω = W1. Thus option (A) and (C) are correct.

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