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Question
Why does a magnetic compass needle pointing North and South in the absence of a nearby magnet get deflected when a bar magnet or a current carrying loop is brought near it. Describe some salient features of magnetic lines of field concept.
Solution
In the absence of an external magnetic field, only Earth’s magnetic field acts due to which magnetic compass needle points north and south direction.
Current carrying loops behave like bar magnets and both have their associated lines of field. This modifies the already existing earth’s magnetic field and a deflection results.
The salient features of magnetic field lines are:
- Magnetic lines form closed and continuous curve.
- Magnetic lines emerge from north-pole to south-pole outside the magnet.
- Magnetic field lines never intersect each other.
- Closer magnetic lines represent a stronger magnetic field and vice-versa.
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