Q9 of 238 Page 73

What is a magnetic field? How can the direction of magnetic field lines at a place be determined?

The area in which the force of magnet is exerted is called magnetic field line to determine the magnetic field line direction you to place a compass on a plane the direction of the needle of a compass shows the north pole, and so will be the direction of the magnetic field line which begins with the north pole and end at south pole.


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7

Fill in the following blanks with suitable words :

(a) Magnetic field lines leave the..........pole of a bar magnet and enter at its........pole.


(b) The earth's magnetic field is rather like that of a ......... magnet with its........pole in the northern hemisphere.

 8

Draw a diagram to show the magnetic field lines around a bar magnet

 10

Explain why, two magnetic field lines do not intersect each other.

 11

When an electric current is passed through any wire, a magnetic field is produced around it. Then why an electric iron connecting cable does not attract nearby iron objects when electric current is switched on through it?