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15. A square plate of 0.1 m side moves parallel to a second plate with a velocity of 0.1 m/s, both plates being immersed in water. If the viscous force is 0.002 N and the coefficient of viscosity is 0.01 poise, distance between the plates in m is

(a)  0.1                                       (b)  0.05

(c)   0.005                                 (d)  0.0005

Answer-d

(2)

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