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An L-C-R series A.C. circuit is tuned to...

An L-C-R series A.C. circuit is tuned to resonance. The impedance of the circuit is ……

A

`[R^2 +(omegaL-1/(omegaC))^2]^(1/2)`

B

`[R^2+(omegaL)^2+(1/(omegaC))^2]^(1/2)`

C

`[R^2+(1/(omegaC)-omegaL)^2]^(1/2)`

D

R

Text Solution

Verified by Experts

The correct Answer is:
D
When resonance occur, then `omegaL=1/(omegaC)`
`|Z|=sqrt(R^2+(omegaL-1/(omegaC))^2)=R`
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KUMAR PRAKASHAN-ALTERNATING CURRENTS -SECTION-D MCQs (DARPAN BASED ON TEXTBOOK)
  1. An L-C-R series circuit with inductor of reactance is 25 Omega, reacta...

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  2. If 1.5 A constant current is passing through a resistance, then the va...

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  3. An L-C-R series A.C. circuit is tuned to resonance. The impedance of t...

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  4. In an L-C-R circuit, L = 8H, C = 0.5muF, R = 100Omega connected in ser...

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  5. In a L-C oscillator circuit at any instant of time current is I and ch...

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  6. …….. does not change with time for D.C. current and D.C. voltage.

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  7. An instantaneous current at any instant in an A.C. series circuit is z...

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  8. An a.c. source is rated at 220 V - 50 Hz. The time taken for voltage t...

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  9. The instantaneous value of current in an A.C. circuit is I=2sin(100pit...

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  10. L, C and R represent physical quantities inductance, capacitance and r...

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  11. An emf E = 4 cos (1000t) volt is applied to an LR circuit of inductanc...

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  12. A coil of inductance L has an inductive reactance of XL in an A.C. cir...

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  13. If 8Omega resistance and 6Omega reactance are present in an A.C. serie...

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  14. Two identical incandescent light bulbs are connected as shown in figur...

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  15. A 220 V, 50 Hz a.c. source is connected an inductance of 0.2 H and a r...

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  16. The resistance of an R-L A.C. circuit is 10 Omega. An emf E0 applied a...

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  17. A resistor 30Omega, inductor of reactance 10Omega and capacitor of rea...

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  18. An inductance of 1 mH, a condenser of 10 muF and a resistance of 50 Om...

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  19. Phasor diagram for the following circuit ……..

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