If $V_{D} = 12 V$ and $V_{E} = 8 V$ then

V_{A} = 56 v o l t

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V_{B} = 68 v o l t

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V_{C} = 52 v o l t

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V_{B} = 48 v o l t

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Solution

The correct option is A $V_{A} = 56 v o l t$
$i = \frac{V_{D} - V_{E}}{R} = \frac{12 - 8}{1} = 4 A$
So,
$V_{C} = V_{D} + i R = 12 + 4 \times 2 = 12 + 8 = 20 V$
$V_{B} = V_{C} + i R = 20 + 4 \times 3 = 20 + 12 = 32 V$
$V_{A} = V_{B} + i R = 32 + 4 \times 6 = 32 + 24 = 56 V$

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