In this IIT JEE physics lecture video, we will discuss magnetism. In this topic of iit jee physics we will discuss the following topic;
- Magnetic poles and bar magnets
- And Magnetic flux lines and properties
So let’s talk about magnetic poles and bar magnets. An isolated magnetic pole does not exist, i.e. the two poles are always present. Thus, by even breaking the magnet into smaller pieces, there will always be two poles, i.e. the North Pole and the South Pole. If we keep breaking the magnet till it reaches a size of an atom, then the electrons move in an ellipse around the nucleus. It is a circulating current and a magnetic effect is produced. The direction of current is opposite to the current of motion of electron. In the bar magnet, there are two poles, i.e. North Pole and South Pole. The flux originates from the North Pole and moves towards the South Pole. The point from which the flux originates is known as the magnetic pole. Magnetic flux lines are complete loop.
Further in physics lectures we have discussed, about the magnetic flux lines and its properties. The properties are;
- Emits from North Pole of the magnet.
- Also exists from, South Pole of the magnet to the North Pole inside the magnet.
- It always follows a closed path; it can be similar to circular or elliptical.
- Direction of tangent shows the direction of magnetic field at that point of the space.
- It does not intersect each other.
- Other properties like flux lines (if the flux lines are far then its magnitude is large and if they are nearby then the magnitude is small.) Magnetic field is denoted by B and is,
B= flux/area, its units are Weber and unit of magnetic field is Tesla.
This is a small topic for iit jee physics video classes. The syllabus of magnetism is small and do not contains many point.