Indian Navy INET Electromagnetic Induction — practice questions

Explore 2 free Electromagnetic Induction questions in Indian Navy INET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Electromagnetic Induction questions and exercises with answers

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Resonance in series LCR circuit occurs when:Read the answer and worked solution →A solenoid has L = 2 H. Current decreases from 5 A to 1 A in 0.1 s. EMF induced:Read the answer and worked solution →

Worked practice questions

Resonance in series LCR circuit occurs when:

X_L + X_C = R
X_L = X_C → ω = 1/sqrt(LC)
R = 0
L = C

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Correct answer: B. X_L = X_C → ω = 1/sqrt(LC)

At resonance, X_L = ωL = 1/(ωC) = X_C. So ω₀ = 1/sqrt(LC). Z = R (minimum), current maximum, power factor = 1.

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A solenoid has L = 2 H. Current decreases from 5 A to 1 A in 0.1 s. EMF induced:

80 V
40 V
20 V
8 V

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Correct answer: A. 80 V

|ε| = L × |dI/dt| = 2 × (4/0.1) = 80 V. Sign indicates EMF opposes decrease (i.e., tries to maintain current).