Physics 2022 JAMB Past Questions - Question 31: How can energy loss be minimized through Eddy-current?

Correct Answer

A

Explanation

Eddy currents are swirling currents induced in conductive materials by a changing magnetic field. These currents can lead to energy loss through resistive heating. To minimize energy loss through eddy currents, several techniques can be employed:

1. Laminating the core: By using laminated or layered cores made of thin sheets of conductive material, the eddy currents are confined to smaller loops, reducing their overall effect and minimizing energy loss.

2. Using magnetic materials with low electrical conductivity: Choosing materials with low electrical conductivity for the core can reduce the magnitude of eddy currents and subsequently decrease energy loss.

3. Designing the shape of the core: By shaping the core in a way that minimizes the closed loops for eddy currents to form, energy loss can be reduced.

4. Adding insulation: Insulating the core or using insulating coatings can help to reduce the formation of eddy currents and minimize energy loss.

By employing these techniques, the detrimental effects of eddy currents on energy loss can be minimized, leading to more efficient systems and devices.