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Explain how a higher p.d. is produced along a secondary coil (4)
1) There is an alternating current
2) Magnetic Field linked to secondary coil to primary coil
3) Changing magnetic flux produces e.m.f in secondary coil
4) Secondary has more turns
What happens when a magnet falls into a copper tube? (5)
1) When magnet falls there is a rate of change of magnetic flux linked with tube
2) Change in flux produces an e.m.f, which is proportional to rate of change of flux (Faraday)
3) Induced e.m.f are in such a direction as to oppose change in flux linkage
4) Force exerted on magnet opposing it’s motion
5) Takes longer to reach end of tube
How does a Cyclotron accelerate protons? (6)
1) Alternating p.d / electric field at a fixed frequency causes protons to accelerate between dees
2) P.d. alternates every half cycle
3) Magnetic field perpendicular to plane of dees/ particle motion
4) Proton path curved by magnetic field
5) As velocity of proton increases, radius of path also increases (r=p/BQ)
6) Time in which a proton remains in a dee is constant
What is Faraday’s Law? (1)
1) Magnitude of induced e.m.f equal to rate of change of flux linkage
What is Lenz’s Law? (1)
1) Direction of induced e.m.f/current oppose motion causing it
Note
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