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Chapter 4: Magnetism (aiman T17) (4.1 Magnetic Field a region around…
Chapter 4: Magnetism (aiman T17)
4.1 Magnetic Field
a region around magnet where magnetic force can be experienced.
2 poles:
North(N) & South (S)
(
N-N or S-S
) = repel.
(
N-S
) = attract
Source of magnetic field:
magnet
magnetic field of earth
current carrying conductor
Magnetic field lines:
the lines that leave
north pole
and enter
south pole
.
can be represented by crosses or dotted circles.
do not intersect one another.
cross
- magnetic field enter
dot circle
- magnetic field leave
Uniform field :
parallel lines of force
Non-uniform field :
non-parallel lines
Magnetic field lines pattern:
Magnetic flux density, B
the magnetic flux per unit area across an area at right angles to the magnetic field.
vector quantity.
direction follows the direction of magnetic field.
unit: Tesla (T) / weber per metre squared.
4.2 Magnetic Field Produced By Current Carrying Conductor
When current flows in conductor, magnetic field produced.
Direction of magnetic field around wire/coil determined by
right hand drip rule.
Magnetic field of straight conductor
Magnetic field of a Solenoid
Magnetic field of circular coil
4.3 Magnetic Force On Moving Charged Particles in Uniform Magnetic Field
Magnetic Force
A stationary electric charge in a magnetic field will not experienced a magnetic force.
If charge move with velocity, magnetic field will experienced magnetic force.
Fleming's Right Hand Rule
Fleming's Left Hand Rule
4.4 Magnetic Force on Current Carrying Conductor in Uniform Magnetic Force
When current-carrying conductor placed in magnetic field,B, thus magnetic force will acts on that conductor.
Magnitude of magnetic force exerts on current-carrying conductor:
4.5 Magnetic Force between Two Parallel Current Carrying Conductor
Force per unit length
Two straight parallel conductors carrying currents:
4.6 Torque On a Coil
T = NIAB cos (teta)
4.7 Motion of Charged Particles in Magnetic Field & Electric Field
The charged particle will experiences the electric force is downward with magnitude & the magnetic force is upwards with magnitude qvB.
If particle travels in a straight line with constant velocity. Hence, the electric & magnetic forces are equal in magnitude.
Fb = Fe
qvB sin(90) = qE ---> v = E/B
Velocity Selector
When charged particle entering the region consists magnetic field only, the particle will make a semicircular path of radius.
Fb = Fc
qvB = mv^2/r
q/m = v/rB
q/m = E/rB^2
