Calculate the Thevenin resistance for the circuit shown

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Calculate the Thevenin resistance for the circuit shown below between A and B—

1. 10 Ω
2. 12 Ω
3. 20 Ω
4. 18 Ω

Correct Option: B

Calculation of Rth:

R_th = 10 + (2 + 2) || 4

= 10 +	4 × 4
	4 + 4

= 10 + 2 = 12 Ω