A group of $N$ cells whose $emf$ varies directly with the internal resistance as per the equation $E_N = 1.5\, r_N$ are connected as shown in the figure below. The current $I$ in the circuit is ........... $amp$
Medium
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$i = \frac{{{E_1} + {E_2} + {E_3} + ..... + {E_n}}}{{({r_1} + {r_2} + {r_3} + ....... + {r_n})}}$
$ = \frac{{1.5({r_1} + {r_2} + {r_3} + ...... + {r_n})}}{{({r_1} + {r_2} + {r_3} + ..... + {r_n})}} = 1.5\,A$.
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