A highly viscous liquid of viscosity coefficient $\eta$ flows through a fixed horiwntal cylindrical tube (fixed from outer surface) of internal radius $r$, thickness $t (t << r)$ and length $l$. Volume of liquid flowing per;second is $Q$ and pressure difference across the tube is $P$. Modulus of rigidity of material of tube is $\beta$. Shear strain in the tube will be
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