Question

1. A calibrated hall sensor (i.e. a very small and special kind of semiconductor) is used to measure magnetic field intensities. Consider a very long, straight wire carrying a current of 0.5 A. If the hall sensor gives a reading of 17 μT, then how far is the sensor from the center of the wire?   a) 2 mm b) 3 mm c) 4 mm d) 5mm e) 6 mm
   
2. If an electron is injected perpendicularly into a magnetic field, it will move in a circular trajectory. If the electron’s radius of motion is 8.0 mm and the magnetic field strength is 26 mT, then what is the electron’s speed? a) 3.0 x 106 m/s b) 0.80 x 107 m/s c) 3.2 x 1010 m/s d) 3.7 x 107 m/s   e) 1.4 x 108 m/s

Answer 1

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