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For the given circuit,
If internal resistance of cell is $1.5 Ω$ , then

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$V_{P} - V_{Q} = - 4 V$

$V_{P} - V_{Q} = - 2.5 V$

$V_{P} - V_{Q} = 4 V$

$V_{P} - V_{Q} = 0$

answer is D.

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Detailed Solution

$i = \frac{20}{4} = 5; i_{1} = i_{2} = 2.5 A$

$V_{A} - V_{P} = 2.5 \times 3 = 7.5 . . . . . . . . . (1)$

$V_{A} - V_{Q} = 2.5 \times 2 = 5 . . . . . . . . . (2)$

(2) - (1)

$\Rightarrow V_{P} - V_{Q} = - 2.5 V$

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