# Shared Flashcard Set

## Details

OCR A Forces,Fields and Energy
Electromagnetic Forces
4
Physics
05/30/2008

Term
 Q1)What equation is the force on a current carrying conductor given by?Q2) Where is the angle θ? and why is it included in the equation?
Definition
 A1) F=BIL sin θA2) θ is the angle between the field lines and the current carrying wire. This angle muct be known to calculate the component of the current perpendicular to the flux.N.B For a current carrying wire to feel a force, the magnetic and electric field lines must be parallel to each other. The wire must therefore be perpendicular to the magnetic field lines.
Term
 What equation is the force exerted by a field on a moving charge within a conductor given by?
Definition
 F=BQv sin θ or F=Bev sin θ (if Q=e-)becauseF=BIl sin θ  and I=Q/tsoF=BQl/t sin θsoF=BQv sinθ
Term
 In Fleming's left hand rule, what do the thumb, 1st finger and middle finger represent?
Definition
 Thumb=force/motion1st finger= field2nd finger= currentMotionFieldI (current)[image]
Term
 Q1)Why do charged particles moving at right angles to a magnetic field follow circular orbits?Q2)How can the radius of the circular orbit be found?
Definition
 A1)Charged particles moving at right angles to a magnetic field always follow circular orbits because the force is always at right angles to the moving charge. This means that the force can act as a centripetal force.A2) centripetal force= mv2/r  and F=BevsoBev=mv2/rthereforer=mv/be
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