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MAGNETIC fIELD

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.

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MAGNETIC fIELD

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  1. MAGNETIC fIELD

  2. 6.1 Magnetic Field • Define magnetic field. • Identify magnetic field sources. • Sketch the magnetic field lines.

  3. 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

  4. 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

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

  6. 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.

  7. 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

  8. 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

  9. The Various Pattern Of Magnetic Field Lines Around The Magnet • Bar magnet

  10. Horseshoe or U magnet

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

  12. 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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