🔍 Key Concepts

• Electromagnetic chokes/inductors and how current through a coil creates a changing magnetic field • Why laminated iron cores are used in electrical components (think eddy currents and mechanical vibration) • How mechanical looseness in an energized magnetic core might show up as a physical symptom

💭 Think About

• When AC current flows through a choke, what happens to the magnetic field in the core, and how often does it change? • If pieces of the laminated core are not tightly bound together, how might they physically react to that changing magnetic field? • Which of the answer choices describes a likely observable effect of that movement, and which choices describe things that are less realistic for a choke?

✅ Before You Answer

• Verify what a filter choke actually is and where it is used (power supplies, smoothing AC ripple). • Consider whether loose laminations would affect electrical connection or mostly mechanical behavior/sound. • Check which option(s) focus on a noise/vibration symptom versus unrelated issues.