Question

question 37

to _________ an object, place the object in the field of a strong electromagnet connected to an ac line.
a. demagnetize
b. charge
c. magnetize
d. weaken

Explanation:

Identify the physical process

Using the Demagnetization knowledge point

An alternating current (AC) source produces a magnetic field that continuously reverses direction and decreases in intensity as the object is slowly withdrawn. This randomized orientation of magnetic domains removes residual magnetism.

Evaluate the given options

Using the Demagnetization knowledge point

• Option a: Demagnetize is the process of removing a magnetic field using an AC electromagnet.
• Option b: Charge refers to electrostatic charging, which is unrelated to magnetic fields.
• Option c: Magnetize requires a strong, constant direct current (DC) field to align domains in one direction.
• Option d: Weaken is a general term, but the specific technical procedure described is for complete demagnetization.

Answer:

• a. demagnetize (Correct answer)
• b. charge
• c. magnetize
• d. weaken