Initially, the beakers A and B have the same amount of air. The beakers are dipped at different temperatures in the water as shown:
So, the temperature of the beaker A is that of the beaker B.
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Solution
Gases expand on heating. So, at a higher temperature, gases occupy more volume.
Since the balloon in the beaker B is inflated, the gas in the beaker occupies more volume than the one in the beaker A.
Hence, the temperature of beaker B is greater than that of the beaker A.