JAMB Exam > JAMB Videos > Physics for JAMB > Eddy Currents - 2
Eddy Currents - 2 Video Lecture | Physics for JAMB
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FAQs on Eddy Currents - 2 Video Lecture - Physics for JAMB
| 1. What are eddy currents? |  |
Ans. Eddy currents are circulating currents induced in a conductor when it is exposed to a changing magnetic field. These currents flow in closed loops and are responsible for the dissipation of energy in conductive materials.
| 2. How are eddy currents produced? | |
Ans. Eddy currents are produced when a conductor is exposed to a changing magnetic field. This can occur when the conductor moves through a magnetic field or when the magnetic field itself changes in intensity. The changing magnetic field induces circulating currents within the conductor, known as eddy currents.
| 3. What is the significance of eddy currents? | |
Ans. Eddy currents have both practical and detrimental effects. On one hand, they are utilized in various applications such as induction heating, electromagnetic braking, and metal detection. On the other hand, they can cause energy loss and undesirable heating in conductive materials, leading to inefficiencies in electrical devices.
| 4. How can eddy currents be minimized or controlled? | |
Ans. Eddy currents can be minimized or controlled by using laminated or layered conductive materials. By separating the conductor into thin layers insulated from each other, the circulation of eddy currents is restricted, thus reducing energy loss. Additionally, the use of magnetic shielding can help redirect the magnetic field away from the conductor, further minimizing the induction of eddy currents.
| 5. Can eddy currents be used in non-destructive testing? | |
Ans. Yes, eddy currents are commonly used in non-destructive testing (NDT). By inducing eddy currents in a conductive material and analyzing the resulting magnetic field, defects or variations in the material's properties can be detected. This technique is particularly useful for inspecting the integrity of metal components, such as pipes, aircraft structures, and automotive parts.
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Nov 15, 2024 Last updated |
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