A barometer kept in an elevator reads 76...

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

zero

76 cm

` gt 76 cm`

`lt 76 cm`

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The correct Answer is:

Initially `p_(0)A` supports the weight of mercury column. While in second case it provides acceleration too.

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