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  • 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.

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.

Answers (1)

Solution:
Due to churning of earth core metals, earth creates a magnetic field around itself.
This effect is called dynamo effect.
Due to magnetic field of earth, any magnetic compass get deflected and try to align itself pointing North and South.
When a bar magnet or current carrying wire comes close to the magnetic needle, the net
magnetic field strength which is the combination of magnetic field due to earth and the current carrying wire
changes.
This new magnetic field deflects the magnetic needle in different direction, which will be along the resultant magnetic field lines.
In the absence of a bar magnet or current carrying wire, the magnetic field strength due to earth can be considered as uniform at a particular place the magnetic field lines will be straight and parallel to each other.
In presence of bar magnet or current carrying wire the magnetic field line get distorted.
Magnetic Field Line (Features):
Magnetic field lines are imaginary lines, which are used to represent magnetic field strength and its direction in the space.
The closeness of magnetic field lines represents the magnetic field strength.
The direction of magnetic field strength at any point is along direction of magnetic field line.
At any point direction can be deduced by using magnetic needle, the North Pole of the magnetic needle will be in the direction of magnetic field line.
These magnetic field lines forms close loop.
If magnetic field lines are drawn equidistant and parallel to each other it represents uniform magnetic field.

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