Given that $v$ is the speed, $r$ is radius and $g$ is acceleration due to gravity. Which of the following is dimensionless?
A$\frac{{{v^2}r}}{g}$
B$\frac{{{v^2}}}{rg}$
C$\frac{{{v^2}}}{g/r}$
D$v^2rg$
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B$\frac{{{v^2}}}{rg}$
b Check by putting $[u] = L{T^{ - 1}},\,[r] = L,\,[g] = L{T^{ - 2}}$
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