Assuming ideal elements in the circuit shown below, the

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Assuming ideal elements in the circuit shown below, the voltage v_ab will be

1. – 3V
2. 0 V
3. 3 V
4. 5 V

Correct Option: A

i = 1 A
∴ V_ab – 2i + 5 = 0
or V_ab = – 5 + 2i
= – 5 + 2 × 1 = –3