EAMCET Engineering 2002 Solved Paper

The van der Waals' equation for a gas is
(P+‌

a

V2

)(V−b)=nRT
where P,V,R,T and n represent the pressure, volume, universal gas constant, absolute temperature and number of moles of a gas, respectively. a and b are constants.
The ratio ‌

b

a

will have the following dimensional formula.