A source vs (t) =V cos 100πt has an internal impedance

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A source v_s (t) =V cos 100πt has an internal impedance of (4 + j3)Ω If a purely resistive load connected to this source has to extract the maximum power out of the source, its value in Ω should be

1. 3
2. 4
3. 5
4. 7

Correct Option: C

For max power R_L = √R²_s + X²_s = √4² + 3² = 5