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 b
Answer
Answer outline and marking scheme
for question: 3
(a) particles would collide
with gas molecules [1 mark]
(b) arrow tangential
in cavity upwards [2 marks]
(c) for circular motion, Bqv =
mvexp2/ r
v increases (q, m and r constant), B must increase [2
marks]
(d) e.g radius or orbit
increase in cyclotron
cyclotron has constant magnetic field
whereas it varies in synchrotron
(M1, A1 for each, max. 4)
[4 marks]
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