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? |
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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. |
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Term
| What equation is the force exerted by a field on a moving charge within a conductor given by? |
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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 |
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Term
| In Fleming's left hand rule, what do the thumb, 1st finger and middle finger represent? |
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Definition
Thumb=force/motion 1st finger= field 2nd finger= current Motion Field I (current) [image] |
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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? |
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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=Bev so Bev=mv2/r therefore r=mv/be |
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