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Question: Answered & Verified by Expert
In an ac circuit, an inductor, a capacitor and a resistor are connected in series with XL=R=XC. Impedance of this circuit is :
PhysicsAlternating CurrentJEE MainJEE Main 2021 (31 Aug Shift 1)
Options:
  • A Zero
  • B R
  • C R2
  • D 2R2
Solution:
2108 Upvotes Verified Answer
The correct answer is: R
Recall the formula of impedance is in terms of resistance, Z=XL-XC2+R2, here, the condition of resonance, XL=XC, it means, 
Z=XL-XL2+R2=R

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