1
NEET 2025
MCQ (Single Correct Answer)
+4
-1
Change Language

To an ac power supply of 220 V at 50 Hz , a resistor of $20 \Omega$, a capacitor of reactance $25 \Omega$ and an inductor of reactance $45 \Omega$ are connected in series. The corresponding current in the circuit and the phase angle between the current and the voltage is, respectively

A
15.6 A and $30^{\circ}$
B
15.6 A and $45^{\circ}$
C
7.8 A and $30^{\circ}$
D
7.8 A and $45^{\circ}$
2
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1
Change Language

In the circuit shown below, the inductance $$L$$ is connected to an ac source. The current flowing in the circuit is $$I=I_0 \sin \omega t$$. The voltage drop $$\left(V_L\right)$$ across $$L$$ is

NEET 2024 (Re-Examination) Physics - Alternating Current Question 2 English

A
$$\omega L I_0 \sin \omega t$$
B
$$\frac{I_0}{\omega L} \sin \omega t$$
C
$$\frac{I_0}{\omega L} \cos \omega t$$
D
$$\omega L I_0 \cos \omega t$$
3
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1
Change Language

A step up transformer is connected to an ac mains supply of $$220 \mathrm{~V}$$ to operate at $$11000 \mathrm{~V}, 88$$ watt. The current in the secondary circuit, ignoring the power loss in the transformer, is

A
8 mA
B
4 mA
C
0.4 A
D
4 A
4
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1
Change Language

The amplitude of the charge oscillating in a circuit decreases exponentially as $$Q=Q_0 e^{-R t/2 L}$$, where $$Q_0$$ is the charge at $$t=0 \mathrm{~s}$$. The time at which charge amplitude decreases to $$0.50 Q_0$$ is nearly:

[Given that $$R=1.5 \Omega, L=12 \mathrm{~mH}, \ln (2)=0.693$$]

A
19.01 ms
B
11.09 ms
C
19.01 s
D
11.09 s
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