For a cell terminal potential difference is 2.2 V when circuit is open and reduces to 1.8V when cell is connected to a resistance of R=`5Omega` then determine internal resistance of cell is:-
A. `(10)/( 9)Omega`
B. `(9)/(10)Omega`
C. `(11)/(9)Omega`
D. `(5)/(9)Omega`