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Alternating Current Physics - Alternating Current

Gujarat Board (GSEB) - STD 12 Science - Physics (GSEB - English Medium). 41 questions in this chapter.

Question types

Alternating Current question types

41 questions across 4 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

41
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4
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5
Question types
Sample Questions

Alternating Current questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 12 Marks Questions2 Marks
A transformer is designed to convert an AC voltage of 220V to an AC voltage of 12V. If the input terminals are connected to a DC voltage of 220V, the transformer usually burns. Explain.
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Q 22 Marks Questions2 Marks
The current in a discharging LR circuit is given by $\text{i}=\text{i}_0\text{e}^{\frac{-\text{t}}{\tau}}$ where $\tau$ is the time constant of the circuit. Calculate the rms current for the period $\text{t}=0$ to $\text{t}=\tau.$
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Q 32 Marks Questions2 Marks
A resistance is connected to an AC source. If a capacitor is included in the series circuit, will the average power absorbed by the resistance increase or decrease? If an inductor of small inductance is also included in the series circuit, will the average power absorbed increase or decrease further?
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Q 42 Marks Questions2 Marks
The dielectric strength of air is 3.0 × 106V/m. A parallel-plate air-capacitor has area 20cm2 and plate separation 0.10mm. Find the maximum rms voltage of an AC source that can be safely connected to this capacitor.
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Q 52 Marks Questions2 Marks
The peak power consumed by a resistive coil, when connected to an AC source, is 80W. Find the energy consumed by the coil in 100 seconds, which is many times larger than the time period of the source.
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Q 63 Marks Question3 Marks
An inductor-coil, a capacitor and an AC source of rms voltage 24V are connected in series. When the frequency of the source is varied, a maximum rms current of 6.0A is observed. If this inductor coil is connected to a battery of emf 12V and internal resistance $4.0\Omega,$ what will be the current?
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Q 83 Marks Question3 Marks
A bulb rated 60W at 220V is connected across a household supply of alternating voltage of 220V. Calculate the maximum instantaneous current through the filament.
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Q 93 Marks Question3 Marks
Consider the situation of the previous problem. Find the average electric field energy stored in the capacitor and the average magnetic field energy stored in the coil.
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Q 103 Marks Question3 Marks
The voltage and current in a series AC circuit are given by, $\text{V}=\text{V}_0\cos\omega\text{t}$ and $\text{i}=\text{i}_0\sin\omega\text{t}.$ What is the power dissipated in the circuit?
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Q 111 Marks Question1 Mark
When an AC source is connected to a capacitor there is a steady-state current in the circuit. Does it mean thatthe charges jump from one plate to the other to complete the circuit?
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Q 141 Marks Question1 Mark
A current $\text{i}_1=\text{i}_0\sin\omega\text{t}$ passes through a resistor of resistance R. How much thermal energy is produced in one time period? A current $\text{i}_2=-\text{i}_0\sin\omega\text{t}$ passes through the resistor. How much thermal energy is produced in one time period? If i1, and i2 both pass through the resistor simultaneously, how much thermal energy is produced? Is the principle of superposition obeyed in this case?
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Q 16M.C.Q (1 Marks)1 Mark
An AC source rated 100V (rms) supplies a current of 10A (rms) to a circuit. The average power delivered by the source:
  1. Must be 1000W.
  2. May be 1000W.
  3. May be greater than 1000W.
  4. May be less than 1000W.
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Q 17M.C.Q (1 Marks)1 Mark
An AC source is rated 220V, 50Hz. The average voltage is calculated in a time interval of 0.01s, It:
  1. Must be zero.
  2. May be zero.
  3. Is never zero.
  4. Is $\Big(\frac{200}{\sqrt{2}}\Big)\text{V}.$
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Q 18M.C.Q (1 Marks)1 Mark
In an AC series circuit, the instantaneous current is zero when the instantaneous voltage is maximum. Connected to the source may be a:
  1. Pure inductor.
  2. Pure capacitor.
  3. Pure resistor.
  4. Combination of an inductor and a capacitor.
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Q 19M.C.Q (1 Marks)1 Mark
The magnetic field energy in an inductor changes from maximum value to minimum value in 5.0ms when connected to an AC source. The frequency of the source:
  1. 20Hz.
  2. 50Hz.
  3. 200Hz.
  4. 500Hz.
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Q 20M.C.Q (1 Marks)1 Mark
An AC source producing emf $\in=\in_{0}\Big[\cos\big(100\pi\text{s}^{-1}\big)\text{t}+\cos\big(500\pi\text{s}^{-1}\big)\text{t}\Big]$ is connected in series with a capacitor and a resistor. The steady-state current in the circuit is found to be $\text{i}=\text{i}_1\cos\Big[\big(100\pi\text{s}^{-1}\big)\text{t}+\phi_1\Big]+\text{i}_2\cos\Big[\big(500\pi\text{s}^{-1}\big)\text{t}+\phi_2\Big].$
  1. i1 > i2
  2. i1 = i2
  3. i1 < i2
  4. The information is insufficient to find the relation between i1 and i2
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