Question

Two batteries of emf ε₁ and ε₂ (ε₂ > ε₁) and internal resistances r₁ and r₂ respectively are connected in parallel as shown in Fig 3.1. 

(a) The equivalent emf ε_eq of the two cells is between ε₁ and ε₂, i.e. ε₁< ε_eq < ε₂.

(b) The equivalent emf ε_eq is smaller than ε₁ .

(c) The ε_eq is given by ε_eq = ε₁ + ε₂ always.

(d) ε_eq is independent of internal resistances r₁ and r₂.

Answer 1

(a) The equivalent emf ε_eq of the two cells is between ε₁ and ε₂, i.e. ε₁< ε_eq < ε₂.