What is eddy currents?

• A. A current in water
• B. A superconductive current
• C. Eddy currents
• D. A static current

Answer: (C)

Eddy currents are circulating electrical currents that appear inside a conductive material when the magnetic field around it changes or when the material moves through a magnetic field. These currents flow in closed loops and oppose the change that created them, in accordance with Lenz’s law. Because they travel through the conductor, they dissipate energy as heat and can cause magnetic braking or heating losses. In aviation contexts, you might encounter them in metal parts near electromagnetic equipment or use them deliberately for nondestructive testing; engineers also design to minimize them by using laminated or insulated structures and shielding.