JEE Main 2021 (Online) 22th July Evening Shift | Alternating Current Question 98 | Physics

	List - I		List - II
(a)	$$\omega L > {1 \over {\omega C}}$$	(i)	Current is in phase with emf
(b)	$$\omega L = {1 \over {\omega C}}$$	(ii)	Current lags behind the applied emf
(c)	$$\omega L < {1 \over {\omega C}}$$	(iii)	Maximum current occurs
(d)	Resonant frequency	(iv)	Current leads the emf

Choose the correct answer from the options given below

a(ii), b(i), c(iv), d(iii)

a(ii), b(i), c(iii), d(iv)

a(iii), b(i), c(iv), d(ii)

a(iv), b(iii), c(ii), d(i)

JEE Main 2021 (Online) 20th July Evening Shift

MCQ (Single Correct Answer)

-1

For a series LCR circuit with R = 100 $$\Omega$$, L = 0.5 mH and C = 0.1 pF connected across 220V$$-$$50 Hz AC supply, the phase angle between current and supplied voltage and the nature of the circuit is :

0$$^\circ$$, resistive circuit

$$ \approx $$ 90$$^\circ$$, predominantly inductive circuit

0$$^\circ$$, resonance circuit

$$ \approx $$ 90$$^\circ$$, predominantly capacitive circuit

JEE Main 2021 (Online) 20th July Morning Shift

MCQ (Single Correct Answer)

-1

AC voltage V(t) = 20 sin$$\omega$$t of frequency 50 Hz is applied to a parallel plate capacitor. The separation between the plates is 2 mm and the area is 1 m². The amplitude of the oscillating displacement current for the applied AC voltage is _________. [Take $$\varepsilon $$₀ = 8.85 $$\times$$ 10^$$-$$12 F/m]

55.58 $$\mu$$A

21.14 $$\mu$$A

27.79 $$\mu$$A

83.37 $$\mu$$A

JEE Main 2021 (Online) 18th March Evening Shift

MCQ (Single Correct Answer)

-1

In a series LCR circuit, the inductive reactance (X_L) is 10$$\Omega$$ and the capacitive reactance (X_C) is 4$$\Omega$$. The resistance (R) in the circuit is 6$$\Omega$$. The power factor of the circuit is :

$${1 \over 2}$$

$${{\sqrt 3 } \over 2}$$

$${1 \over {\sqrt 2 }}$$

$${1 \over {2\sqrt 2 }}$$

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