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Sample Exam II 29.012 _Spring 2010

# Sample Exam II 29.012 _Spring 2010 - Name Sample Test II...

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Name: Sample Test II 29.012 Date: Spring 2010 1. An electron traveling horizontally enters a region where a uniform magnetic field is directed into the plane of the paper as shown. Which one of the following phrases most accurately describes the motion of the electron once it has entered the field? A) upward and parabolic B) upward and circular C) downward and circular D) upward, along a straight line E) downward and parabolic 2. A charged particle is fired from a gun with a velocity of 5.2 × 10 4 m/s at an angle of 35° with respect to a 0.0045-T magnetic field. If the magnetic field exerts a force of 0.0026 N on the particle, determine the magnitude of the charge. Page 1

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3. A long, straight wire carries a 6.0-A current that is directed in the positive x direction. When a uniform magnetic field is applied perpendicular to a 3.0-m segment of the wire, the magnetic force on the segment is 0.36 N, directed in the negative y direction, as shown. What are the magnitude and direction of the magnetic field? A) 0.020 T, out of the paper B) 0.020 T, into the paper C) 0.060 T, out of the paper D) 0.060 T, into the paper E) 0.65 T, out of the paper
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