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Alternating Current question

2022 · Q150
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Alternating Current question

2022 · Q150

NEETPhysicsAlternating CurrentMCQ+4 / −1

Given below are two statements

Statement I : In an a.c circuit, the current through a capacitor leads the voltage across it.

Statement II : In a.c circuit containing pure capacitance only, the phase difference between the current and voltage is π\piπ.

In the light of the above statements, choose the most appropriate answer from the options given below

  1. A
    Statement I is incorrect but Statement II is correct
  2. B
    Both Statement I and Statement II are correct
  3. C
    Both Statement I and Statement II are incorrect
  4. D
    Statement I is correct but Statement II is incorrect
View written solutionFree

Correct answer: D

NEET 2022 Phase 2 Physics - Alternating Current Question 17 English Explanation 1

$$V = {V_0}\sin \omega t$$

$V = {q \over C}$

$q = CV\sin \omega t$

$${{dq} \over {dt}} = CV{d \over {dt}}\sin \omega t$$

$$i = CV\omega \cos \omega t$$

$$i = CV\omega \sin \left( {\omega t + {\pi \over 2}} \right)$$

In a.c circuit current lead by voltage by a phase ${\pi \over 2}$

NEET 2022 Phase 2 Physics - Alternating Current Question 17 English Explanation 2

Thus statement I is correct while II is incorrect.

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