A) \[\ge \,4km/h\]
B) Greater than zero but less than 4km/h
C) Only 4km/h
D) None of these
Correct Answer: B
Solution :
As, drift \[(\Delta x)=({{\Delta }_{b}})\,\Delta t\] \[=({{V}_{br}}\cos \theta +{{V}_{r}})\,\Delta t\] For \[\Delta x=0,\,{{V}_{r}}=-{{V}_{br}}\,\cos \theta \] \[\Rightarrow \] \[{{({{V}_{r}})}_{\max }}={{V}_{br}}\] For, \[{{V}_{r}}>{{V}_{br}},\] We cannot have zero drift.
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