# A pair of infinitely long, counter-rotating line vortices of the same circulation strength $\Gamma$ are situated a distance $h$ apart in a fluid, as shown in the figure. The vortices will (A) rotate counter-clockwise about the midpoint with the tangential velocity at the line vortex equal to $\frac{\Gamma}{2 \pi h}$ (B) rotate counter-clockwise about the midpoint with the tangential velocity at the line vortex equal to $\frac{\Gamma}{4 \pi h}$ (C) $\quad$ translate along $+y$ direction with velocity at the line vortex equal to $\frac{\Gamma}{2 \pi h}$ (D) $\quad$ translate along $+y$ direction with velocity at the line vortex equal to $\frac{\Gamma}{4 \pi h}$

## Question ID - 155370 :-  A pair of infinitely long, counter-rotating line vortices of the same circulation strength $\Gamma$ are situated a distance $h$ apart in a fluid, as shown in the figure. The vortices will (A) rotate counter-clockwise about the midpoint with the tangential velocity at the line vortex equal to $\frac{\Gamma}{2 \pi h}$ (B) rotate counter-clockwise about the midpoint with the tangential velocity at the line vortex equal to $\frac{\Gamma}{4 \pi h}$ (C) $\quad$ translate along $+y$ direction with velocity at the line vortex equal to $\frac{\Gamma}{2 \pi h}$ (D) $\quad$ translate along $+y$ direction with velocity at the line vortex equal to $\frac{\Gamma}{4 \pi h}$

(C) $\quad$ translate along $+y$ direction with velocity at the line vortex equal to $\frac{\Gamma}{2 \pi h}$