Question

An electromagnet is :

• A. A permanent magnet
• B. A temporary magnet
• C. Both 1 \& 2
• D. None of the above

Hint:

The defining feature of an electromagnet is its controllable magnetism. It can be turned 'on' and 'off', and its strength can be adjusted. This makes it a temporary magnet, unlike permanent magnets which retain their magnetism.

Answer 1

The Correct Option is B

Step 1: Define what an electromagnet is.
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. It typically consists of a coil of wire wrapped around a core of ferromagnetic material (like soft iron). Step 2: Understand the characteristics of an electromagnet.
The key characteristic of an electromagnet is that its magnetism is temporary and can be controlled.
It acts as a magnet only when current flows through its coil.
When the current is switched off, the core material loses most or all of its magnetism (depending on the core material and its retentivity).
The strength and polarity of an electromagnet can be varied by changing the current, the number of turns in the coil, or by reversing the direction of the current. Step 3: Differentiate between permanent and temporary magnets.

Permanent magnets are materials that retain their magnetic properties even after the external magnetizing field is removed. Examples include magnets made from steel or alloys like Alnico.
Temporary magnets are materials that behave as magnets only when they are under the influence of an external magnetic field (like an electromagnet) or when an electric current is flowing through them. They lose their magnetism once the external influence is removed. Step 4: Conclude based on the characteristics.
Since an electromagnet's magnetic field can be turned on or off by controlling the current, it fits the definition of a temporary magnet. It does not retain its magnetism permanently. Step 5: Compare with the given options.
Option (2) "A temporary magnet" is the correct classification for an electromagnet. (2) A temporary magnet