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Question
A glass bulb is balanced by a brass weight in a sensitive beam balance. Now the balance is covered by a glass-jar which is then evacuated. Then:
A glass bulb is balanced by a brass weight in a sensitive beam balance. Now the balance is covered by a glass-jar which is then evacuated. Then:
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Solution
The correct option is B the pan containing the bulb will go down
When the glass bulb is weighed by a brass weight in air both of them displaces air, but the glass bulb being of much larger volume displaces larger volume of the air. when the system is covered by a bell jar. which is then evacuated the upthrust due to displaced air will be absent and the glass bulb will weigh more. thus, pen with the bulb goes down
When the glass bulb is weighed by a brass weight in air both of them displaces air, but the glass bulb being of much larger volume displaces larger volume of the air. when the system is covered by a bell jar. which is then evacuated the upthrust due to displaced air will be absent and the glass bulb will weigh more. thus, pen with the bulb goes down
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