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A barometer kept in a lift reads 11 cm o...

A barometer kept in a lift reads 11 cm of mercury, when the lift is stationary. Then the lift starts moving down with an acceleration a, where a lt g. What is the air pressure in the lift, as read by the barometer ?

A

`rhogh`

B

`rho(g+a)`

C

`rho(g-a)`

D

`(rhogh)/(a)`

Text Solution

Verified by Experts

The correct Answer is:
B
When the lift is at rest, the barometer pressure P`=rhogh`. But when the lift moves down with an acceleration a where altg, the resultant acceleration becomes (g-a) and P=`rhoh(g-a)`
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