Question

AC magnets are made of laminated iron

A. For better induction
B. To reduce heating effect
C. For AC and DC use
D. To prevent chattering

Answer 1

AC magnets are made of laminated iron to reduce heating due to eddy currents which are induced by the alternating magnetic fields in devices like transformers, based on Faraday's law of induction. So, the correct option is A.

Step-by-step explanation:

AC magnets are commonly found in appliances and devices that work with alternating current (AC). To reduce losses due to eddy currents, these magnets are made from laminated iron cores. When a metallic conductor is subjected to a changing magnetic field, as is the case with AC, eddy currents are induced in the mass of the conductor. These currents generate heat and can cause energy loss. By laminating the iron core—that is, constructing it out of thin, electrically insulated sheets—the path for eddy currents is interrupted or reduced, which significantly decreases these currents and therefore reduces resistive heating. Transformers are a prime example of devices that use laminated coils based on Faraday's law of induction. They are designed to minimize the heating effect, rather than for use with DC or to prevent chattering or enable better induction alone.