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In determing viscosity (eta) by poiseuil...

In determing viscosity `(eta)` by poiseuille's method for formula used `eta = (pi p r^4)/(8 vl)`. Which of the quantities in the formula must be measured more accurately

A

p

B

r

C

v

D

l

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The correct Answer is:
B
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AAKASH SERIES-UNITS AND MEASUREMENT-EXERCISE - I
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