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Combination of Resistances

Two batteries...

Question

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

A

4

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B

5

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C

6

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D

7

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Solution

The correct option is B 5
$i = \frac{3}{3} = 1$
$V_{A} - 6 + 1 - V_{B} = 0$
therefore $V_{A} - V_{B} = 5$

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