CBSE Class 10 Syllabus 2023March 29, 2023
39 Insightful Publications
Every person has heard and has an idea of what a magnet is. Magnets are substances that have the properties of attracting certain metals such as nickel, iron, cobalt, and so on. On the other hand, the property of attraction is called magnetism, and magnetism is mediated by a magnetic field. These are simple rules which magnets follow and are a major part in the field of physics.
Students of Class 7 Maharashtra board are introduced to the concept of magnetic field and field lines which will help them understand the concepts and build the foundation for future Physics classes. This article has provided an in-depth explanation on magnetic field and field lines from which students can build a proper understanding of the concepts and be confident. Read on to know more about the topic.
Magnetic field can be defined as the region surrounding the magnet from which the force of the magnet can be detected. A magnetic field in a magnet is created by electric current and magnetic dipole which imparts magnetic forces on other particles such as iron that are inside the magnetic field. Moreover, it has a vector quantity that has both magnitude and direction. However, one thing which is important to note is that the magnetic field of two magnets repel each other. To have a better understanding of magnetic fields students can check the image below and the properties of magnetic fields given in this article.
There are certain properties that magnetic fields follow and it is important for Class 7 Maharashtra Board Physics students to have an idea of the concepts as it will help them master the concept. The properties of magnetic field are as follows:
Magnetic field lines are the imaginary lines that attract other magnetic poles towards the magnet. For example, if a magnet is placed on a table filled with iron filings, then the iron filings will uniformly align themselves in different lines. These curved lines are the magnetic fields. Magnetic field lines always begin from the north pole and end on the south pole of the magnet and the field lines are the path along which an isolated unit north pole would move along in the field.
The properties which dictates magnetic field lines are as follows:
We know that a magnetic field is produced by a magnet or a charge in motion. The magnetic field can apply some force to magnetic materials. Interestingly, the magnetic field cannot apply a force on a stationary charge but can apply force on a moving charge.
The force on a charge in motion is given by the charge multiplied by the cross-product of the velocity and magnetic field. The image given below will give a proper idea to students how magnetic force acts.
The magnetic field is a vector quantity, and the total magnetic field at a point is given by the vector sum of individual magnetic fields at that point.
For continuous bodies,
The net magnetic field is given by integrating the magnetic field due to the differential element of the continuous body.
Magnetic force on a current-carrying wire due to a magnetic field is given by,
Fleming’s Left-hand rule
The direction of the force in the above equation is in the direction of the cross product, (dl→×B→). Fleming’s left-hand rule simplifies it. According to Fleming’s left-hand rule, if we align the index finger in the direction of the magnetic field and the middle finger in the direction of the current, then our thumb points towards the direction of the force on the current-carrying wire.
We hope that this article on the Magnetic Field and Field Lines has helped you. If you have an queries for doubts, feel free to contact us by writing to us at [email protected]
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