An AC ammeter is used to measure the current in a circuit. When a given direct current passes through the circuit, the ac ammeter reads 6 A. When another alternating current passes through the circuit, the AC ammeter reads 8 A. Then the reading of this ammeter if DC and AC flow through the circuit simultaneously is:
1. A
2. 14 A
3. 10 A
4. 15 A
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf q is the capacitor's charge and i is the current at time t, the voltage V will be:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA direct current of 5 A is superimposed on an alternating current I = 10 flowing through a wire. The effective value of the resulting current will be:
1. \(15/2~A\)
2.
3.
4. 15 A
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn L-C-R series circuit with 100 Ω resistance is connected to an AC source of 200 V and an angular frequency of 300 rad/s. When only the capacitance is removed, the current lags behind the voltage by . When only the inductance is removed, the current leads the voltage by . Calculate the power dissipated in the L-C-R circuit.
1. 200 W
2. 400 W
3. 300 W
4. Zero
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFor which of the following reasons are LC oscillations not sustainable for long?
1. | Every inductor has some resistance. |
2. | The effect of resistance is to introduce a damping effect on the charge & current in the circuit and the oscillations finally die away. |
3. | Even if the resistance is zero, the total energy of the system is radiated away from the system in the form of electromagnetic radiation. |
4. | All of the above |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn ideal resistance R, ideal inductance L, ideal capacitance C, and AC voltmeters are connected to an AC source as shown. At resonance:
1. Reading in \(V_3\) = Reading in \(V_1\)
2. Reading in \(V_1\) = Reading in \(V_2\)
3. Reading in \(V_2\) = Reading in \(V_4\)
4. Reading in \(V_2\) = Reading in \(V_3\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA transistor-oscillator using a resonant circuit with an inductance L (of negligible resistance) and a capacitance C has a frequency f. If L is doubled and C is changed to 4C, the frequency will be:
1. f/4
2. 8f
3. f/(2√2)
4. f/2
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
In an L-C-R series AC circuit, the voltage across each of the components L, C and R is 50 V. The voltage across the L-R combination will be:
1. 50 V
2. \(50 \sqrt{2} ~V\)
3. 100 V
4. 0 V
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe AC source in the circuit shown in the figure produces a voltage V = 20cos(2000t) volts. Neglecting source resistance, the voltmeter and ammeter readings will be (approximately):
1. 4 V, 2.0 A
2. 0 V, 2 A
3. 0 V, 1.4 A
4. 8 V, 2.0 A
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
In the circuit shown, the AC source has a voltage
V = 20 cos(ωt) volts with ω= 2000 rad/s. The amplitude of the current will be nearest to:
1. 2 A
2. 3.3 A
3. 2/ A
4. A
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology