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Question
Why do lines of magnetic force never cross? Why do they never pass through a neutral point?
Solution
No two lines of magnetic force cross each other because in that case there would be two directions of resultant magnetic force at a given point, which is not possible.
Magnetic lines of force never pass through neutral points because at the neutral point magnetic field due to the bar magnet is neutralized by the earth’s magnetic field.
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RELATED QUESTIONS
What is a neutral point? How is the position of neutral point located with the use of a compass needle?
State the positions of neutral points when a magnet is placed with its axis in the magnetic meridian and with its north pole (i) pointing towards the geographic north and (ii) pointing towards the geographic south.
Complete the following sentence :
At a neutral point, the resultant magnetic field is ___________.
Complete the following sentence :
The neutral points of a bar magnet kept with its north pole pointing towards geographic north are located ____________.
Give the various methods for demagnetizing a magnet.
Different bars are brought near each pole of a compass needle. Complete the following table:
| Nature of bar | Action on the compass needle | |
| North pole | South pole | |
| (i) Glass | No action | __________ |
| (ii) _________ | Attracted | Attracted |
| (iii) North pole of a bar magnet | __________ | ___________ |
| (iv) The south pole of a bar magnet | __________ | repulsion |
