The tangential force of viscous drag on ...

The tangential force of viscous drag on any layer of the liquid is directly proporational to the velocity gradient `(dv)/(dx).` Then the direction of velocity gradient is

perpendicular to the direction of flow of the liquid.

parallel to the direction of the flow of the liquid.

opposite to the direction of the flow of the liquid.

independent of the direction of the flow of liquid.

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