Question

# A barometer kept in an elevator reads $$76 cm$$ when it is at rest. What will be barometric reading when the elevator accelerates upwards?

A
(g+a)h0g
B
gh0g+a
C
agh0
D
gah0

Solution

## The correct option is A $$\dfrac {(g+a)h_0}{g}$$When a body moves upward the acceleration due to gravity is, $${g'} = g + a$$ Hence, the pressure is $$P = h_0\rho \left( {g + a} \right)$$ $$= \dfrac{{h_0\left( {g + a} \right)}}{g}$$ Hence, the barometer reading will be more than the measured value at rest.Physics

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