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If the fluid velocity for a potential flow is given by $V(x,y)=u(x,y)i+v(x,y)j$ with usual notations, then the slope of the potential line at $(x,y)$ is

  1. $\dfrac{v}{u} \\$
  2. $-\dfrac{u}{v} \\$
  3. $\dfrac{u^2}{v^2} \\$
  4. $\dfrac{u}{v}$
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