EMI & AC - Electromagnetic Induction

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Q1. What is the relationship between the frequency and the inductive reactance in an AC circuit? (2022)

Solution:

Inductive reactance is directly proportional to the frequency of the AC source.

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Q2. In an AC circuit, what is the phase difference between voltage and current in a purely inductive circuit? (2021)

Solution:

In a purely inductive AC circuit, the current lags the voltage by 90 degrees.

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Q3. 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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Q4. 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.

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Q5. Which of the following devices uses the principle of electromagnetic induction? (2022)

Solution:

A transformer uses the principle of electromagnetic induction to transfer electrical energy between circuits.

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Q6. In an AC circuit, the current lags the voltage by 90 degrees in which of the following components? (2020)

Solution:

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

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Q7. 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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Q8. What is the effect of increasing the frequency of AC on the inductive reactance? (2021)

Solution:

Inductive reactance increases with the frequency of AC.

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Q9. Faraday's law of electromagnetic induction states that the induced EMF in a circuit is proportional to what? (2019)

Solution:

Faraday's law states that the induced EMF is proportional to the rate of change of magnetic flux.

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Q10. What is the reactance of an inductor at a frequency of 50 Hz if the inductance is 0.1 H? (2023)

Solution:

Reactance (X_L) = 2πfL = 2π(50)(0.1) = 31.4 Ω.