midterm2_b_2010

# midterm2_b_2010 - Exam General Physics 219 Fall 2010...

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Exam General Physics 219 Fall 2010 Midterm 2 1

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Problem 1 R=? v=10 m/s d=1mm θ=? θ |B|=10 T 6 -3 In a certain oscilloscope an electron beam is deﬂected by a magnetic ﬁeld as indicated in the ﬁgure. The speed of the electrons is v = 10 6 m s , the strength of the magnetic ﬁeld (pointing out of the page) is | ~ B | = 10 - 3 T and the width of the region where the magnetic ﬁeld is present is d = 1 mm . The mass of the electron is m e 10 - 30 Kg and the charge q = - e = - 1 . 6 × 10 - 19 C . With all this information: a) Find a formula for the radius R of the circular trajectory inside the mag- netic ﬁeld in terms of the given data. b) Compute (numerically) the deﬂection angle θ assuming that it is small, namely sin θ θ . 2
We want to build a Jacob’s ladder that requires a voltage of 5 kV . If we use an AC source of voltage 100 V to power the primary of a transformer with N 1 = 50 turns: a) How many turns does the secondary need to have to get the desired 5 kV ? 3

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midterm2_b_2010 - Exam General Physics 219 Fall 2010...

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