If value of R is changed then

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7.Alternating Current

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If value of $R$ is changed then

A

voltage across $L$ remains same

B

voltage across $C$ remains same

C

voltage across $L-C$ combination remains same

D

voltage across $L-C$ combination changes

Solution

$\therefore \mathrm{V}_{\mathrm{L}}=\mathrm{V}_{\mathrm{C}} \Rightarrow \mathrm{IX}_{\mathrm{L}}=\mathrm{IX}_{\mathrm{C}}$

$\Rightarrow \mathrm{X}_{\mathrm{L}}=\mathrm{X}_{\mathrm{C}}$

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 $0 .$

Standard 12

Physics

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(JEE MAIN-2024)