Chapter 24, Problem 9STP

To determine

To Choose: The correct option.

Answer to Problem 9STP

Option D

Explanation of Solution

Introduction:

A magnet is a substance which attracts other magnetic materials. A magnet has two poles-North pole and south pole. Magnetic field lines emerge from north pole and enter in south pole.

In a temporary magnet, the domains are not always aligned. In the presence of a strong magnetic field, the domains get aligned and the material acts as a magnet. For example, iron. It can be turned off by removing the applied magnetic field. The strength of the magnetic field of a temporary magnet can be varied.

In a permanent magnet, the domains are always aligned and it cannot be turned off. A permanent magnet is composed of magnetic materials such as cobalt, nickel and iron.

Conclusion:

Thus, option D is the correct option.