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Alternating Current Circuit

This page consists of solved comprehensive questions of Alternating Current Circuit in cluded in the Physics course for Second Year students.

Question 1 Explain with diagram sinusoidal alternating voltage and sinusoidal alternating current.
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Question 2 Define mean, peak and rms values of sinusoidal voltage and sinusoidal current. Obtain mathematical expression for the rms value of current.
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Question 3 A sinusoidal alternating voltage of angular frequency ω is connected across a resistor R. Find mathematical expressions for instantaneous voltage, instantaneous current and average power dissipated per cycle of the applied voltage.
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Question 4 A sinusoidal alternating voltage of angular velocity ω is connected across a capacitor C. Find the mathematical expressions for instantaneous voltage, instantaneous current and the average power dissipated per cycle of the applied voltage.
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Question 5 A sinusoidal voltage of angular frequency ω is connected across an inductance L. Find mathematical expressions for instantaneous voltage, instantaneous current and power dissipated per cycle.
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Question 6 Explain the term impedance of an AC circuit. Find expression for the impedance of an RLC series circuit.
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Question 7 Discuss maximum power is transferred when the impedance of load and source match to each other.
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Question 8 In RL series circuit, will the current lag or lead the applied alternating voltage? Explain the answer with a phasor diagram.
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Question 9 In an RC series circuit, will the current lag or lead the applied alternating voltage? Explain the answer with a phosor diagram.
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Question 10

What do you mean by phasor diagram? Why we use it for sinusoidal current and voltage?
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Question 11 Explain the resonance of a series RLC circuit. Show that resonance occurs at a frequency determined by fr.

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Question 12 Describe the statement of four Maxwell’s equation.Use Maxwell theory to show that.
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