2.6 - Magnetic fields
● RECALL: Fleming’s left hand rule
Magnetic field strength
●
F (magnetic force on conductor)=B(magnetic flux density [T ])× I ×l(length of conductor)×sin θ (θ betwee
● F=Bqv sin θ {for charged particles}
○ A charged particle follows a circular path in a magnetic field (circular motion)
2
m v Bq sinθ= mv
○ Bqv sin θ= ,
r r
mv p p
ASSUME at right angles at all times, Bq= = , r=
r r Bq
● ***Magnetic flux: Φ [Wb ]=B × A (cross sectional areaof conductor [m2 ])×cos θ
● ***Magnetic flux linkage: N Φ[Wb t ]=BAN cos θ where N = no. of turns on coil
●
0˚ 90˚
Electromagnetic induction
● ***Faraday’s law (& Lenz’s law): ε (induced EMF [V ])=¿
1
● RECALL: Fleming’s left hand rule
Magnetic field strength
●
F (magnetic force on conductor)=B(magnetic flux density [T ])× I ×l(length of conductor)×sin θ (θ betwee
● F=Bqv sin θ {for charged particles}
○ A charged particle follows a circular path in a magnetic field (circular motion)
2
m v Bq sinθ= mv
○ Bqv sin θ= ,
r r
mv p p
ASSUME at right angles at all times, Bq= = , r=
r r Bq
● ***Magnetic flux: Φ [Wb ]=B × A (cross sectional areaof conductor [m2 ])×cos θ
● ***Magnetic flux linkage: N Φ[Wb t ]=BAN cos θ where N = no. of turns on coil
●
0˚ 90˚
Electromagnetic induction
● ***Faraday’s law (& Lenz’s law): ε (induced EMF [V ])=¿
1
