$A$ conducting rod of length $l$ moves with a constant velocity $\upsilon$ perpendicular to a long,straight wire carrying a current $I$,as shown in the figure. Calculate the $emf$ generated between the ends of the rod.
- A$\frac{\mu_0 \upsilon I l}{\pi r}$
- B$\frac{\mu_0 \upsilon I l}{2 \pi r}$
- C$\frac{2 \mu_0 \upsilon I l}{\pi r}$
- D$\frac{\mu_0 \upsilon I l}{4 \pi r}$
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