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Two batteries...

Question

Two batteries of different emfs and different internal resistances are connected as shown. What is the voltage across A and B in volts

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Solution

$I = \frac{6 - 3}{3} = 1 A$

$V_{A} - 6 + 1 \times 1 - V_{B} = 0$

$V_{A} - V_{B} = 5 V$

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