A space 2.5 cm wide between two large plane surfaces is filled with oil. Force required to drag a ve

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9-1.Fluid Mechanics

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A space $2.5\ cm$ wide between two large plane surfaces is filled with oil. Force required to drag a very thin plate of area $0.5\ m^2$ just midway the surfaces at a speed of $0.5\ m/sec$ is $1\ N$. The coefficient of viscosity in $kg-s/m^2$ is

A

$5 \times {10^{ - 2}}$

B

$2.5 \times {10^{ - 2}}$

C

$1 \times {10^{ - 2}}$

D

$7.5 \times {10^{ - 2}}$

Solution

$r=\frac{r_{1} r_{2}}{r_{1}-r_{2}}=\frac{5 \times 4}{5-4}=20 \mathrm{cm}$

Standard 11

Physics

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