Question

Experiment-I (Permanent Magnetic):

Draw two lines at right angles to each other on the sheet of paper, then position the compass on it so that the pivot of the compass needle lies directly above the point of intersection of the lines. Turn the sheet of paper until the compass needle lies along the shorter line and mark the ends of this line N and S (see Fig. 4).

Place the bar magnet on the sheet of paper at about 10 cm from the compass needle and mark two field lines on the paper (Fig. 3 and Fig. 4).

• Move the compass slowly once around the bar magnet along the marked field lines, observing the movement of the compass needle. Note what you observe under Result - Observation I-1.

Result - Observation I-1

Note your observation. ....................................................................................................

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Result - Sketch I-1

Sketch the position of the compass needle as observed in Observation 1, and the magnetic field lines around the permanent magnetic.

Answer 1

This is the experiment that you have to perform you can do the first part where you have to put the compass and just roll the paper
Now I have drawn the image of bar magnet in the figure 1 where blue region is a South pole of the magnet and red region is the north pole of the magnet
The bar magnet have two poles means every magnet in the world that exist contain two poles
And magnetic field line is always directed from north pole to south pole from outside of the magnet and from inside of the magnetic field line goes from South region to the north region which I haven't shown because that cannot be seen it is only can be imagine
now consider the figure 2 to where I have drawn the bar magnet and I will move the compass around the bar magnet and note the position I will put dot at the arrow of the compass so that I can trace the field lines
now in position one the South pole of the compass is attracted towards the north pole of the bar magnet and and arrow which is pointing towards the north of the compass is directed opposite to the north of the bar magnet which shows the field lines of a bar magnet is coming out of the north pole the error of a compass will always directed toward the magnetic field
The field line from the bar magnet will come out from the north pole and then we'll go toward the South pole by moving around the by moving around the compass and tracing the path we can understand this
now if we move the compass in a different path we can find the different fields LINE which are coming out of the north pole and going to the South pole
From this experiment We have observed that the field lines of a bar magnet is come from the north pole to the South pole
The bar magnet has a north pole and a south pole at two ends. Even if you break a bar magnet from the middle, both the pieces will still have a north pole and a south pole, no matter how many pieces you break it in.

The magnetic field lines of a magnet form continuous closed loops.
The tangent to the field line at any point represents the direction of the net magnetic field B at that point.
Larger the number of field lines crossing per unit area, the stronger is the magnitude of the magnetic field B.
The magnetic field lines do not intersect.
the magnetic field strength is stronger when the magnetic field line are very closed and v curve in the magnetic field lines have a gap in between that means the magnetic field strength are very strong at the pole

I have put one last image of magnetic field line for your understanding