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← ScienceWhich effect occurs during the injection of viscous fluid through a thin needle?
A)Increased back pressure at the entry✓
B)Decreased turbulence in the nozzle
C)Reduced energy dissipation via friction
D)Enhanced flow rate at output end
💡 Explanation
Increased back pressure at the entry point characterizes high viscosity fluid injection, because the fluid's high internal friction requires greater applied force to initiate flow via viscous pressure drop. Therefore, pressure increases, rather than decreased turbulence, because viscous fluids typically dampen turbulence.
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