If 12 Ω resistor draws a current of 1 A as shown in

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If 12 Ω resistor draws a current of 1 A as shown in the figure given below, the value of resistance R is

1. 4 Ω
2. 6 Ω
3. 8 Ω
4. 18 Ω

Correct Option: B

V_A = 12
i = 1 – 2 = – 1 amp.
By KVL, 6 – iR – 12 × 1 = 0
⇒ iR = – 6

⇒ R =	-6	= 6 Ω
	(-1)