Question Detail

PHY 102 Test Compilation PHY 102 26 Objective Question
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Question

Which of the following is the best way to demagnetise a magnetised steel needle?
Options
A break it into two pieces
B make it red hot and then let it cool
C leave it inside a solenoid carrying direct current
D slowly pull it out of a solenoid carrying alternating current
Correct Answer
Correct Answer

Option D is the correct answer.

Detailed Explanation

Slowly withdrawing from an AC solenoid randomises magnetic domains as the field shrinks while reversing.

Hint

Slowly withdrawing from an AC solenoid randomises magnetic domains as the field shrinks while reversing.

Question Info

Course: PHY 102
Topic: Test Compilation PHY 102 26
Type: Objective
Difficulty: Not specified
Question 1542 of 1819
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