7.Alternating Current
hard

$LC$ પરિપથમાં ઇન્ડક્ટર $L=40\;mH$ અને કેપેસીટર $C=100\;\mu F$ છે.જો પરિપથમાં $V(t)=10sin(314t)$ વૉલ્ટેજ આપવામાં આવે તો પરિપથમાંથી કેટલો પ્રવાહ પસાર થશે?

A

$0.52 \cos 314 t$

B

$0.52 \sin 314 t$

C

$10 \cos 314 t$

D

$5.2 \cos 314 t$

(JEE MAIN-2020)

Solution

$\mathrm{X}_{\mathrm{L}}=\omega \mathrm{L}=314 \times 40 \times 10^{-3}=12.56 \Omega$

$\mathrm{X}_{\mathrm{C}}=\frac{1}{\omega \mathrm{C}}=\frac{1}{314 \times 100 \times 10^{-6}}$

$=\frac{10^{4}}{314}=31.84 \Omega$

$\mathrm{V}_{\mathrm{m}}=\mathrm{I}_{\mathrm{m}}\left(\mathrm{X}_{\mathrm{C}}-\mathrm{X}_{\mathrm{L}}\right)$

$10=\mathrm{I}_{\mathrm{m}}(31.84-12.56)$

$I_{m}=\frac{10}{19.28}=0.52 A$

$I=0.52 \sin \left(314 t+\frac{\pi}{2}\right)$

Standard 12
Physics

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