MCQ
If value of $R$ is changed then
- Avoltage across $L$ remains same
- Bvoltage across $C$ remains same
- ✓voltage across $L-C$ combination remains same
- Dvoltage across $L-C$ combination changes
✓
Answer
Correct option: C.
voltage across $L-C$ combination remains same
c
$\therefore \mathrm{V}_{\mathrm{L}}=\mathrm{V}_{\mathrm{C}} \Rightarrow \mathrm{IX}_{\mathrm{L}}=\mathrm{IX}_{\mathrm{C}}$
$\therefore \mathrm{V}_{\mathrm{L}}=\mathrm{V}_{\mathrm{C}} \Rightarrow \mathrm{IX}_{\mathrm{L}}=\mathrm{IX}_{\mathrm{C}}$
$\Rightarrow \mathrm{X}_{\mathrm{L}}=\mathrm{X}_{\mathrm{C}}$
Voltage across $\mathrm{LC}$ combination $=\mathrm{I}\left(\mathrm{X}_{\mathrm{L}}-\mathrm{X}_{\mathrm{C}}\right)=0$
$\therefore \mathrm{X}_{\mathrm{L}}-\mathrm{X}_{\mathrm{C}}=0$
$\Rightarrow$ Voltage across $\mathrm{LC}$ combination is always $0 .$
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