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Find the minimum force required to drag a hard polythene plate of area `2 m^(2)` on a thin film of oil of thickness `0.25 cm` and `eta= 15` poise. Assume the speed of the plate is `10 cm s^(-1)`.

A

`2.4xx10^7dyn e`

B

`1.8xx10^7dyn e`

C

`1.2xx10^7dyn e`

D

`6.0xx10^6dyn e`

Text Solution

Verified by Experts

The correct Answer is:
C
`F=etaA(dv)/(dy)=etaA(v)/(y)`
`=15xx2xx10^4(10)/(0.25)=1.2xx10^7den e`
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