8. A cell of emf E having an internal resistance r is connected to an external resistance R. The potential difference V across the resistance R varies R as shown in figure by the curve: E R- (1) A (2) B (3) C (4) D 9. Two cells of same e.m.f. E but of different internal resistances, and 2 are connected in series with an external resistance 'R'. The potential drop across the first cell is found to be zero. The external resistance 'R' is- (1) +12 (2) 112 (3) 12-11 (4) 10. The potential difference between the points M and N is :- 12V 302 ww 6V www MN (1) 8.4 volt (3) 1.2 volt (2) 15.6 volt (4) 22.08 volt