1) Each of the six ideal batteries of emf 20 V is connected to an external resistance of $4 \Omega$ as shown in the figure. The circuit through the resistance is A) 6 A B) 3 A C) 4 A D) 5 A Answer: Option *Explanation: Resistance =$4\Omega$ The equivalent emf of the combination $E_{eq}=nE=3 \times 20=60$ The cell have no internal resistance $\therefore$ Main current flowing through the load $i= \frac{nE}{R}=\frac{60}{4}=15 A$
