The terminal velocity v of a small steel...

The terminal velocity v of a small steel ball of radius r falling under gravity through a column of viscous liquid of coefficient of viscosity `eta` depends on mass of the bass m, acceleration due to gravity g, coefficient of viscosity `eta` and radius r. Which of the following relations is dimensionally correct ?

`(mg eta)/(r)`

`mg etar`

`(mgr)/(eta)`

`(mg)/(reta)`

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