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Consider the equation T = 2pi sqrt(l/g) ...

Consider the equation `T = 2pi sqrt(l/g)` and check whether it is correct or not.

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We know dimensional formulae of T `l` and g are [T], [L], `[LT^(-2)]` respectively .
`:. ` Dimensional formula of `sqrt((l)/(g))=sqrt((L)/(LT^(-2)))=sqrt(T^(2))=|T|`
Dimensional formula of left side is also [T]. As 2t is a dimensionless quantity, the dimensional formula of lefi hand side of the equation is equal to dimensional formula of right hand side. Hence we conclude that the given equation is a correct one.
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