Make a note on Direction of magnetic field line.
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A magnetic field is a picture that we use as a tool to describe how the magnetic force is distributed in the space around and within something magnetic. Explain
Most of us have some familiarity with everyday magnetic objects and recognize that there can be forces between them. We understand that magnets have two poles and that depending on the orientation of two magnets there can be attraction (opposite poles) or repulsion (similar poles). We recognize that there is some region extending around a magnet where this happens. The magnetic field describes this region.
There are two different ways that a magnetic field is typically illustrated: Explain : some details
The magnetic field is described mathematically as a vector field. This vector field can be plotted directly as a set of many vectors drawn on a grid. Each vector points in the direction that a compass would point and has length dependent on the strength of the magnetic force. Explain compasses Arranging many small compasses in a grid pattern and placing the grid in a magnetic field illustrates this technique. The only difference here is that a compass doesn't indicate the strength of a field.
Figure 1: Vector field plot for a bar magnet
Figure 1: Vector field plot for a bar magnet
Figure 1: Vector field plot for a bar magnet.
An alternative way to represent the information contained within a vector field is with the use of field lines. Here we dispense with the grid pattern and connect the vectors with smooth lines. We can draw as many lines as we want.
Figure 2: Field line plot for a bar magnet
Figure 2: Field line plot for a bar magnet
Figure 2: Field line plot for a bar magnet
The field-line description has some useful properties:
Magnetic field lines never cross.
Magnetic field lines naturally bunch together in regions where the magnetic field is the strongest. This means that the density of field lines indicates the strength of the field.
Magnetic field lines don't start or stop anywhere, they always make closed loops and will continue inside a magnetic material (though sometimes they are not drawn this way).
We require a way to indicate the direction of the field. This is usually done by drawing arrowheads along the lines. Sometimes arrowheads are not drawn and the direction must be indicated in some other way. For historical reasons the convention is to label one region 'north' and another 'south' and draw field lines only from these 'poles'. The field is assumed to follow the lines from north to south. 'N' and 'S' labels are usually placed on the ends of a magnetic field source, although strictly this is arbitrary and there is nothing special about these locations. Explain magnetic field of the Earth
Explanation:
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Answer:
Einstein is said to have been fascinated by a compass as a child, perhaps musing on how the needle felt a force without direct physical contact. His ability to think deeply and clearly about action at a distance, particularly for gravitational, electric, and magnetic forces, later enabled him to create his revolutionary theory of relativity. Since magnetic forces act at a distance, we define a magnetic field to represent magnetic forces. The pictorial representation of magnetic field lines is very useful in visualizing the strength and direction of the magnetic field.
Three diagrams illustrating magnetic field lines. Figure a shows a bar magnet with a number of compasses arranged along the magnet on either side. The needles of the compasses at the north pole of the magnet point away from the pole. The needles of the compasses at the south pole of the magnet point toward the pole. The needles of compasses in between the two poles point parallel to the magnet, toward the south pole. Figure b shows lines running from the north pole out and around to the south pole. Figure c shows lines as closed loops running from the north pole outside the magnet and around the south pole, and then up through the magnet to the north pole.
Small compasses used to test a magnetic field will not disturb it. (This is analogous to the way we tested electric fields with a small test charge. In both cases, the fields represent only the object creating them and not the probe testing them.) Figure 2 shows how the magnetic field appears for a current loop and a long straight wire, as could be explored with small compasses. A small compass placed in these fields will align itself parallel to the field line at its location, with its north pole pointing in the direction of B. Note the symbols used for field into and out of the paper.
Figure a: magnetic field of a circular current loop with a current moving counter-clockwise. The field lines are also roughly circular, running up through the center of the current loop, and back down outside the loop. Figure b: a straight wire with a current running straight up. The magnetic field lines circle the wire in a counter-clockwise direction. Figure c: a right hand with the thumb pointing up, parallel to a wire with the current running upward. The figures of the hand curl around the wire in the counter-clockwise direction to show the direction of the magnetic field when current is up. The symbol to represent magnetic field lines running out of the surface and toward the viewer—B out—is a circle with a sold circle inside. The symbol to represent magnetic field lines running into the surface and away from the viewer—B in—is represented with a circle with an x inside it. When the current is running straight up, B out is to the left and B in is to the right.