Which of the following is a correct use of electromagnets?
I. In separating magnetic material from junk
II. In sharpening pencils
Show answer & explanation
Correct answer: A
Explanation
Correct Answer:
Option 1: Only I
Explanation:
An electromagnet is a magnet that exhibits magnetic properties only when an electric current flows through it. It is used in industries to separate magnetic materials, such as iron, from scrap metal. Electromagnets attached to large cranes can easily lift heavy metals.
On the other hand, sharpening a pencil is a mechanical process in which magnetism plays no role. Therefore, only the first statement is correct.
Potential Questions for Upcoming Exams:
Question: Where are electromagnets used?
Answer: Cranes, Motors
Question: What is a permanent magnet?
Answer: One possessing permanent properties
Question: What is electric current?
Answer: The flow of electrons
Question: How does a motor work?
Answer: Using electrical energy