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In a series L-C-R circuit shown in the figure , what is the resonance frequency and the current at the resonating frequency?A. `0^(@)`B. `30^(@)`C. `45^(@)`D. `60^(@)` |
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Answer» Correct Answer - A a) Impedance, `Z=sqrt(R^(2)+(X_(L)-X_(C))^(2)` `10=sqrt((10^(2)+(X_(L)-X-( C))^(2)` `rArr 100 = 100+(X_(L)-X_(C))^(2)` `rArr X_(L)-X_(C)=0`…………(i) Let `phi` is the phase difference between current and voltage `therefore tanphi = (X_(L)-X_(C))/R` `therefore tanphi=0/R` `phi=0` [From Eq. (i)]` |
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