In an ideal transformer, the turns ratio is $$\cfrac{N_p}{N_s}=\cfrac{1}{2} .$$ The ratio $$V_s:V_p$$ is equal to (the symbols carry their usual meaning):
1. $$2:1$$
2. $$1:1$$
3. $$1:4$$
4. $$1:2$$
Subtopic:  Transformer |
64%
From NCERT
NEET - 2024
Hints

$$10~\mu\text F$$ capacitor is connected to a $$210~\text V,50~\text{Hz}$$ source as shown in the figure. The peak current in the circuit is nearly $$(\pi = 3.14)$$:

1. $$0.93~\text A$$
2. $$1.20~\text A$$
3. $$0.35~\text A$$
4. $$0.58~\text A$$
Subtopic:  RMS & Average Values |
54%
From NCERT
NEET - 2024
Hints

$$L,C$$ and $$R$$ represent the value of inductance, capacitance and resistance, respectively. The factor which has the same dimensions as that of the inverse of resonance frequency is:
1. $$\sqrt{LC}$$
2. $$\sqrt{\dfrac{L}{C}}$$
3. $$\dfrac{C}{L}$$
4. $$\dfrac{R}{L}$$
Subtopic:  Different Types of AC Circuits |
72%
From NCERT
NEET - 2024
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In the circuit shown below, the inductance $$L$$ is connected to a source. The current flowing in the circuit is $${I=I_{0}\sin\omega t.}$$ The voltage drop $$(V_L)$$ across $$L$$ is:
 1 $$\omega L~I_0\sin\omega t$$ 2 $$\frac{{I}_0}{\omega{L}}\sin\omega t$$ 3 $$\frac{{I}_0}{\omega{L}}\cos\omega t$$ 4 $$\omega L~I_0\cos\omega t$$
Subtopic:  Different Types of AC Circuits |
From NCERT
NEET - 2024
Hints

A step-up transformer is connected to an AC mains supply of $$220~\text V$$ to operate at $$11000~\text V, 88$$ watt. The current in the secondary circuit, ignoring the power loss in the transformer, is:
1. $$8~\text{mA}$$
2. $$4~\text{mA}$$
3. $$0.4~\text{A}$$
4. $$4~\text{A}$$
Subtopic:  Transformer |
61%
From NCERT
NEET - 2024
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An ac source is connected to a capacitor $$C$$. Due to decrease in its operating frequency:
 1 capacitive reactance remains constant 2 capacitive reactance decreases. 3 displacement current increases. 4 displacement current decreases.
Subtopic:  Different Types of AC Circuits |
From NCERT
NEET - 2023
Hints

$$12~\text{V},60~\text{W}$$ lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of $$220~\text{V}$$. Assuming the transformer to be ideal, what is the current in the primary winding?
1. $$0.37~\text{A}$$
2. $$0.27~\text{A}$$
3. $$2.7~\text{A}$$
4. $$3.7~\text{A}$$
Subtopic:  Transformer |
68%
From NCERT
NEET - 2023
Hints

In a series $${LCR}$$ circuit, the inductance $${L}$$ is $$10~\text{mH}$$, capacitance $${C}$$ is $$1~\mu\text{F}$$ and resistance $${R}$$ is $$100~\Omega$$. The frequency at which resonance occurs is:
 1 $$1.59~\text{kHz}$$ 2 $$15.9~\text{rad/s}$$ 3 $$15.9~\text{kHz}$$ 4 $$1.59~\text{rad/s}$$
Subtopic:  Different Types of AC Circuits |
61%
From NCERT
NEET - 2023
Hints

The net impedance of circuit (as shown in the figure) will be:

1. $$25~\Omega$$
2. $$10\sqrt{2}~\Omega$$
3. $$15~\Omega$$
4. $$5\sqrt{5}~\Omega$$
Subtopic:  Different Types of AC Circuits |
59%
From NCERT
NEET - 2023
An AC source is connected to the given circuit. The value of $$\phi$$ will be:
 1 $$60^\circ$$ 2 $$90^\circ$$ 3 $$30^\circ$$ 4 $$45^\circ$$