An electric circuit is given below. V₁ = 1 V and Resistance R = 1000 Ω.

The current through the resistance R is very close to 1 mA and the voltage across point A and B, V_AB = 1 V. Now the circuit is changed to:

(where value of V₂ = 5 V. The internal resistances of both the batteries are 0·1 Ω.)
The current through the resistance R is about:

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