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A horizontal plate (10cmxx10cm ) moves ...

A horizontal plate `(10cmxx10cm ) ` moves on a layer of oil of thickness 4 mm with a constant speed of 10 cm/s . The coefficient of viscosity of oil is 4 poise. The constant speed of the plae is

A

`10^(3)` dyne

B

`10^(4)` dyne

C

`10^(5)` dyne

D

None of these

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