Electrical Engineering ⇒ Topic : Dynamically Induced E.M.F.

David
 
Dynamically Induced emf or Motional emf When a single conductor of length 1 meters moves with a velocity of v m/sec at right angles to uniform magnetic field of flux density B tesla between N and S poles, the emf induced in the conductor is given by e = Blν volts. If the conductor moves at an angle q to the direction of the magnetic field, the emf induced in the conductor is given by e = Blν sin θ.If the conductor moves parallel to the flux lines, the emf induced in the conductor = O. Motional emf is associated with energy conversion from electrical to mechanical or mechanical to electrical.  
 
Sachin
 
Consider a single conductor of length 1 metres moving at *right angles to a uniform magnetic field of B Wb/m^{2} with a velocity of v m/s [See Figure (a)]. Suppose the conductor moves through a small distance dx in dt seconds. Then area swept by the conductor is = 1 x dx.
FIGURE (A) FIGURE (B) Flux cut, dΦ = Flux density x Area swept = Bl dx Wb According to Faraday's laws of electromagnetic induction, the magnitude of e.m.f. e induced in the conductor is given by ;
Special case: If the conductor moves at angle ∅ to the magnetic field [See Figure (b)], then the velocity at which the conductor moves across the field is *v sin ∅.
The direction of the induced e.m.f. can be determined by Fleming's righthand rule.  
 
Sachin
 
Consider a single conductor of length 1 metres moving at *right angles to a uniform magnetic field of B Wb/m^{2} with a velocity of v m/s [See Figure (a)]. Suppose the conductor moves through a small distance dx in dt seconds. Then area swept by the conductor is = 1 x dx.
FIGURE (A) FIGURE (B) Flux cut, dΦ = Flux density x Area swept = Bl dx Wb According to Faraday's laws of electromagnetic induction, the magnitude of e.m.f. e induced in the conductor is given by ;
Special case: If the conductor moves at angle ∅ to the magnetic field [See Figure (b)], then the velocity at which the conductor moves across the field is *v sin ∅.
The direction of the induced e.m.f. can be determined by Fleming's righthand rule.  
 
Sachin
 
Consider a single conductor of length 1 metres moving at *right angles to a uniform magnetic field of B Wb/m^{2} with a velocity of v m/s [See Figure (a)]. Suppose the conductor moves through a small distance dx in dt seconds. Then area swept by the conductor is = 1 x dx.
FIGURE (A) FIGURE (B) Flux cut, dΦ = Flux density x Area swept = Bl dx Wb According to Faraday's laws of electromagnetic induction, the magnitude of e.m.f. e induced in the conductor is given by ;
Special case: If the conductor moves at angle ∅ to the magnetic field [See Figure (b)], then the velocity at which the conductor moves across the field is *v sin ∅.
The direction of the induced e.m.f. can be determined by Fleming's righthand rule.  
 
Sachin
 
Consider a single conductor of length 1 metres moving at *right angles to a uniform magnetic field of B Wb/m^{2} with a velocity of v m/s [See Figure (a)]. Suppose the conductor moves through a small distance dx in dt seconds. Then area swept by the conductor is = 1 x dx.
FIGURE (A) FIGURE (B) Flux cut, dΦ = Flux density x Area swept = Bl dx Wb According to Faraday's laws of electromagnetic induction, the magnitude of e.m.f. e induced in the conductor is given by ;
Special case: If the conductor moves at angle ∅ to the magnetic field [See Figure (b)], then the velocity at which the conductor moves across the field is *v sin ∅.
The direction of the induced e.m.f. can be determined by Fleming's righthand rule.  
 
Sachin
 
Consider a single conductor of length 1 metres moving at *right angles to a uniform magnetic field of B Wb/m^{2} with a velocity of v m/s [See Figure (a)]. Suppose the conductor moves through a small distance dx in dt seconds. Then area swept by the conductor is = 1 x dx.
FIGURE (A) FIGURE (B) Flux cut, dΦ = Flux density x Area swept = Bl dx Wb According to Faraday's laws of electromagnetic induction, the magnitude of e.m.f. e induced in the conductor is given by ;
Special case: If the conductor moves at angle ∅ to the magnetic field [See Figure (b)], then the velocity at which the conductor moves across the field is *v sin ∅.
The direction of the induced e.m.f. can be determined by Fleming's righthand rule.  
 
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