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 θ A2) 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^{}) because F=BIl sin θ and I=Q/t so F=BQl/t sin θ so F=BQv sinθ 


Term
In Fleming's left hand rule, what do the thumb, 1st finger and middle finger represent? 

Definition
Thumb=force/motion 1st finger= field 2nd finger= current Motion Field I (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= mv^{2}/r and F=Bev so Bev=mv^{2}/r therefore r=mv/be 

