NEET
- Exam
- NEET
- Subject
- Physics
- Chapter
- Alternating Current
NEET · Physics · Alternating Current
Resonance occurs in a series LCR circuit when the frequency of the...
Resonance occurs in a series LCR circuit when the frequency of the applied emf is 1000 Hz. Then
(a) when frequency (=900 ), then the current through the voltage source will be ahead of e.m.f. of the source
(b) the impedance of the circuit is minimum at (1000 )
(c) at resonance the voltage across L and current in C differ in phase by (180^{{}^{\circ}})
(d) If the value of C is doubled resonance occurs at (2000 )
Options
- Aonly a & b are correct
- Ba, b, c are correct
- Cc & d are correct
- Dall are correct
Correct answer
A. only a & b are correct
Step-by-step solution
At frequency lower than resonant frequency since (\mathrm{X}_{\mathrm{C}}>\mathrm{X}_{\mathrm{L}})
(\therefore) Current leads voltage
(\rightarrow) At resonance, impedance is minimum.
(\rightarrow) At resonance, phase diff. between voltage across L and current in C is (\frac{\pi}{2})
(\rightarrow \mathrm{f}=\frac{1}{2 \pi \sqrt{\mathrm{LC}}})