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MAGNETISM (MAGNETIC FIELD (Have two plates (North, South, Same Poles repel…
MAGNETISM
MAGNETIC FIELD
A region around a magnet where a magnetic force can be experienced
Have two plates
North
South
Same Poles repel each other
Opposite pole attract each other
Sources of magnetic field
Magnet
Magnetic field on earth
Current Carrying Conductor
Magnetic field line
Line to present Magnetic Field
Magnetic field lines leave the north pole and enters the south pole of a magnet
Magnetic Field Line Pattern
Magnetic flux density , B
Defined as magnetic flux per unit area across an area at right angles to the magnetic field
Magnetic Force on Moving Charged Particles in uniform magnetic field line
NEGATIVELY CHARGED
POSITIVELY CHARGE PATICLES
F=qvBsinθ
Stationary electric charged in a magnetic field will not experience a magnetic force . But if the charged is moving with a velocity in a magnetic field then it will experience a magnetic force
Magnetic Field Produce by current-carrying conductor
Direction of magnetic field around the wire or coil
Thumb=Current
Others=Mgnetic field lines
STRAIGHT CONDUCTOR
CIRCULAR COIL
B=µoIN/2R
SOLENOID
B=µoIN/l
Magnetic Force on a current carrying conductor in a uniform magnetic field
When a current carrying conductor is placed in a magnetic field thus a magnetic force will acts on that conductor
F=IIBsinθ
Motion of charged particle in magnetic field line and electric field
v=E/B
Fb=Fc
Consider a postively charged particle with mass , charged , and velocity enters a region of space where the electric and magnetic field are perpendicular to the particles velocity and to each other as shown in figure below
Magnetic Force Between Two Parallel Current Carrying Conductors
Current same direction=2 conductors are attrat
Current different direction=2 conductors are repel
Torque on a coil
Angle between vector area A and B
NIABsinφ
Angle between the plane of the coil and B
τ=NIABsinθ
MAXIMUM
sin90 / cos 0
τmax=NIAB.
