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# MAGNETIC fIELD.

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MAGNETIC fIELD

6.1 Magnetic Field Define magnetic field.
Identify magnetic field sources. Sketch the magnetic field lines.

Magnetic Field A region around a magnet where a magnetic force can be experienced. A stationary electric charge is surrounded by an electric field only. Magnetic field has two poles: Poles (N-N or S-S) repel each other Poles (N-S or S-N) attract each other

6.1.1 Magnetic Field Lines Used to represent a magnetic field
Magnetic field lines leave the north pole and enters the south poles of the magnets

• • • • • • • Magnetic field lines leave the page perpendicularly
Magnetic field lines can be represented by crosses or by dotted circles x x x x x x x x x x x x x x Magnetic field lines enter the pages perpendicularly • • • • • • • Magnetic field lines leave the page perpendicularly

A uniform field is represented by parallel lines of force
The number of lines passing perpendicularly through unit area at all cross sections in a magnetic field are same.

A non uniform field is represented by non parallel lines of force
The number of magnetic field lines varies at different unit cross-section area. The number of lines per unit cross sectional area is proportional to the magnitude of the magnetic field Magnetic field lines do not intersect one another Weaker field line in A Stronger field line in B

6.1.2 Magnetic Field Lines Pattern
The pattern of the magnetic field lines can be determined by using : Sprinkling iron filling on paper Compass needles

The Various Pattern Of Magnetic Field Lines Around The Magnet
Bar magnet

Horseshoe or U magnet

Two bar magnet (unlike poles) – attract
Two bar magnet (like poles) - repel

6.1.3 Earth’s Magnetic field
A giant bar magnet with pole near each geographic pole of the earth. The magnetic poles are lifted away from the rotational axis by an angle of 11.5˚. The north pole of a compass needle points toward the north magnetic pole of the Earth The north geographical pole of the Earth is actually near the south pole of the Earth’s magnetic field The field lines are horizontally near the equator but enter or leave Earth vertically near the pole

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