Eddy Currents
Eddy currents are induced circulating currents leading to:
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Eddy currents are?
Eddy currents are?
High Q factor in resonant circuit implies:
High Q factor in resonant circuit implies:
Magnitude of impedance Z of series RLC at angular frequency ω is:
Magnitude of impedance Z of series RLC at angular frequency ω is:
At resonance in series RLC circuit current is maximum because:
At resonance in series RLC circuit current is maximum because:
Instantaneous AC voltage form V = V0 sin(ω t) has rms value:
Instantaneous AC voltage form V = V0 sin(ω t) has rms value:
Induced EMF magnitude equals rate of change of:
Induced EMF magnitude equals rate of change of:
Lenz's law ensures induced current direction opposes:
Lenz's law ensures induced current direction opposes:
Induced EMF in inductor L with changing current di/dt is:
Induced EMF in inductor L with changing current di/dt is:
Inductive reactance X_L in AC of angular frequency ω is:
Inductive reactance X_L in AC of angular frequency ω is:
Capacitive reactance X_C is:
Capacitive reactance X_C is:
About This Question
- Subject
- physics
- Chapter
- electromagnetic induction and ac
- Topic
- eddy currents
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Energy loss heating
When a solid conductor is placed in a changing magnetic field, circulating loops of current are induced throughout the bulk material.
- These are Eddy Currents.
- Because conductors have resistance, these currents dissipate energy as heat (I2R loss).
- To minimize this in transformers and motors, iron cores are laminated (divided into thin sheets insulated from each other) to break up the current paths.
This medium difficulty physics question is from the chapter electromagnetic induction and ac, covering the topic of eddy currents. It appeared in the 2025 exam.
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