Question

Three batteries of emf 1V and internal resistance 1 Ω each are connected as shown. Effective emf of combination between the points PQ is –

• A. Zero
• B. 1V
• C. 2V
• D. $\frac{2}{3}$V

Answer 1

Answer: (A)

Zero

Answer 2

E_net = $\frac{E_{1}r_{2}–E_{2}r_{1}}{r_{1} + r_{2}}$ = $\frac{2–2}{2 + 1}$ = 0