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
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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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