Question

if an object is placed in the field of a strong electromagnet connected to an ac line, the object will be ______.
a. demagnetized
b. magnetized

Explanation:

Analyze the magnetic field of an AC electromagnet

Using the Demagnetization knowledge point
An alternating current (AC) line produces a rapidly reversing magnetic field. When a magnetic object is placed inside this field, its magnetic domains are forced to continuously realign with the changing polarity.

Determine the effect on the object's domains

Using the Demagnetization knowledge point
As the AC magnetic field alternates and is gradually reduced or as the object is slowly withdrawn, the magnetic domains are left in a randomized, disorganized state, which removes any net magnetization.

Answer:

• a. demagnetized (Correct answer)
• b. magnetized