Q127 / 160 · TS EAMCET 2017 · Physics
Each of the six ideal batteries of emf $20 \mathrm{~V}$ is comnected to an external resistance of $4 \Omega$ as shown in the figure. The current through the resistance is
- A$6 \mathrm{~A}$
- B$3 \mathrm{~A}$
- C$4 \mathrm{~A}$
- Correct answerD$15 \mathrm{~A}$
Solution
Resistance $=4 \Omega$
The equivalent emf of the combination
$$
E_{e q}=n E=3 \times 20=60
$$
The cell have no internal resistance.
$\therefore$ Main current flowing through the load
$$
i=\frac{n E}{R}=\frac{60}{4}=15 \mathrm{~A}
$$
Hence, the correct answer is option: 'D'.