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Question

The rate of flow of a liquid Q through a capillary tube depends upon the pressure gradient (Pl), radius of the capillary (r), coefficient viscosity η and constant of proportionality is π8. The equation for the rate of flow of the liquid Q is given by :

A
Q=πpr28ηl
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B
Q=πpr48ηl
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C
Q=π8pr2η2l
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D
Q=8ηlπpr4
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Solution

The correct option is B Q=πpr48ηl
Q=π8(M1L0T2)α(L1)β(M1L1T1)γ
Q=M0L3T1
α=1,β=4,γ=1
Q=π8pr4ηl

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