AP EAMCET202421 May 2024Evening ShiftPhysicsCurrent ElectricityActual
A cell of emf 1.2 V and internal resistance 2 is connected in parallel to another cell of emf 1.5 V and internal resistance 1 . If the like poles of the cells are connected together, the emf of the combination of the two cells is
Options
- A0.8 V
- B3.9 V
- C2.7 V
- D1.4 V
Correct answer
D. 1.4 V
Step-by-step solution
aligned & E ₁=1.2 ~V , r ₁=2 , E ₂=1.5 ~V , r ₂=1 & E _ eq = E ₁ r ₁ + E ₂ r ₂ 1 r ₁ + 1 r ₂ = 1.2 2 + 1.5 1 1 2 + 1 1 = 0.6+1.5 1.5 & =1.4 ~V aligned