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प्रश्न
Explain the method of plotting the magnetic field lines by using a small compass needle.
उत्तर
Method of plotting the magnetic field lines using a compass needle:
Fix a sheet of paper on a drawing board by means of board pins. Place a small compass needle at position 1 as shown in fig (a) and looking from the top of the needle, mark two pencil dots exactly at two ends of the needle. Then move the compass needle to position 2 in such a way that one end of needle coincides with the second pencil dot. Repeat the process of moving the compass needle to positions 3, 4,… to obtain several dots. On joining the different dots, you will get a straight line. Thus one line of magnetic field of earth is traced.
(a) Plotting a field line with a compass needle
(b) Lines of uniform magnetic field of earth
This process is repeated starting from a different point and tracing out another line of magnetic field. In this manner, several lines of magnetic field can be drawn. Each line should be labeled with an arrow from the south pole of the needle towards the north pole to indicate the direction of the magnetic field. Fig (b) shows several magnetic lines so obtained.
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संबंधित प्रश्न
The shape of the earth's magnetic field resembles that of an imaginary:
(a) U-shaped magnet
(b) Straight conductor carrying current
(c) Current-carrying circular coil
(d) Bar magnet
The strength of the magnetic field between the poles of an electromagnet would be unchanged if:
An electron beam enters a magnetic field at right angles to it as shown in the Figure.
The direction of force acting on the electron beam will be:
to the left
to the right
into the page
out of the page
What is a lodestone?
In following figure, draw at least two magnetic field lines between the two magnets.
(a) 
Figure. shows a bar magnet placed on the table top with its north pole pointing towards south. The arrow shows the north-south direction. There are no other magnets or magnetic materials nearby.
Insert two magnetic field lines on either side of the magnet using arrow head to show the direction of each field line.
Which substances are used for making electromagnets?
Write a note on the 'magnetic field'.
State any two properties of a magnet.
When the conductor is perpendicular to the magnetic field, the force will be the ______, When it is parallel to the magnetic field, the force will be ______.
