EMI & AC - Electromagnetic Induction

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Q1. What is the reactance of an inductor in an AC circuit with frequency f? (2023)

Solution:

The reactance of an inductor in an AC circuit is given by the formula X_L = 2πfL.

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Q2. In a circuit with an inductor, what happens to the current when the voltage is suddenly increased? (2020)

Solution:

In a circuit with an inductor, the current increases gradually due to the inductor's opposition to changes in current.

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Q3. In an RLC series circuit, what happens to the impedance at resonance? (2020)

Solution:

At resonance in an RLC series circuit, the impedance is equal to the resistance.

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Q4. What is the effect of frequency on the inductive reactance? (2023)

Solution:

Inductive reactance is directly proportional to frequency; as frequency increases, inductive reactance increases.

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Q5. In an AC circuit, the current lags behind the voltage by 90 degrees in which component? (2020)

Solution:

In an inductor, the current lags behind the voltage by 90 degrees.

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Q6. In a series RLC circuit, what happens to the impedance at resonance? (2021)

Solution:

At resonance in a series RLC circuit, the impedance is at a minimum.

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Q7. In an AC circuit, the current lags the voltage by 90 degrees in which type of circuit? (2020)

Solution:

In an inductive circuit, the current lags the voltage by 90 degrees.

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Q8. Which of the following devices operates on the principle of electromagnetic induction? (2019)

Solution:

All of the above devices operate on the principle of electromagnetic induction.

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Q9. What happens to the induced emf when the rate of change of magnetic flux increases? (2019)

Solution:

The induced emf increases when the rate of change of magnetic flux increases, according to Faraday's Law.

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Q10. Which law states that the induced EMF in a closed loop is equal to the negative rate of change of magnetic flux through the loop? (2022)

Solution:

Faraday's Law states that the induced EMF in a closed loop is equal to the negative rate of change of magnetic flux through the loop.