1
JEE Main 2024 (Online) 4th April Morning Shift
MCQ (Single Correct Answer)
+4
-1

In an ac circuit, the instantaneous current is zero, when the instantaneous voltage is maximum. In this case, the source may be connected to :

A. pure inductor.

B. pure capacitor.

C. pure resistor.

D. combination of an inductor and capacitor.

Choose the correct answer from the options given below :

A
A, B and C only
B
A and B only
C
A, B and D only
D
B, C and D only
2
JEE Main 2024 (Online) 1st February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A parallel plate capacitor has a capacitance $\mathrm{C}=200~ \mathrm{pF}$. It is connected to $230 \mathrm{~V}$ ac supply with an angular frequency $300~ \mathrm{rad} / \mathrm{s}$. The rms value of conduction current in the circuit and displacement current in the capacitor respectively are :
A
$14.3 ~\mu \mathrm{A}$ and $143 ~\mu \mathrm{A}$
B
$13.8 ~\mu \mathrm{A}$ and $13.8 ~\mu \mathrm{A}$
C
$13.8 ~\mu \mathrm{A}$ and $138 ~\mu \mathrm{A}$
D
$1.38 ~\mu \mathrm{A}$ and $1.38 ~\mu \mathrm{A}$
3
JEE Main 2024 (Online) 1st February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In series LCR circuit, the capacitance is changed from $C$ to $4 C$. To keep the resonance frequency unchanged, the new inductance should be:
A
increased by $2 \mathrm{~L}$
B
reduced by $\frac{1}{4} \mathrm{~L}$
C
reduced by $\frac{3}{4} \mathrm{~L}$
D
increased to $4 \mathrm{~L}$
4
JEE Main 2024 (Online) 31st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

An AC voltage $$V=20 \sin 200 \pi t$$ is applied to a series LCR circuit which drives a current $$I=10 \sin \left(200 \pi t+\frac{\pi}{3}\right)$$. The average power dissipated is:

A
21.6 W
B
200 W
C
173.2 W
D
50 W
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