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Q.

A barometer kept in an elevator reads 76 cm when it is at rest. If the elevator goes up with increasing speed, the reading will be

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a

zero

b

76 cm

c

> 76 cm

d

< 76 cm

answer is D.

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Detailed Solution

Initially, upthrust  ρ0A supports the weight of mercury column in barometer. While in second case, it provides acceleration too. So, the reading will decrease.
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