Emf of a cell is 2.2 volt. When resistance R = 5 Ω is connected in series, potential drop across the cell becomes 1.8 volt. Value of internal resistance of the cell is
A. 10/9 Ω
B. 7/12 Ω
C. 9/10 Ω
D. 12/7 Ω
Answer:A
Emf of a cell is 2.2 volt. When resistance R = 5 Ω is connected in series, potential drop across the cell becomes 1.8 volt. Value of internal resistance of the cell is
A. 10/9 Ω B. 7/12 Ω C. 9/10 Ω D. 12/7 Ω