Part A A Hall-effect probe to measure magnetic field strengths needs to be calibrated in a known magnetic field. Although it is not easy to do, magnetic fields can be precisely measured by measuring the cyclotron frequency of protons. A testing laboratory adjusts a magnetic field until the proton's cyclotron frequency is 9.70 MHz . At this field strength, the Hall voltage on the probe is 0.546 mV when the current through the probe is 0.143 mA . Later, when an unknown magnetic field is measured, the Hall voltage at the same current is 1.740 mV . What is the strength of this magnetic field? Express your answer with the appropriate units. HA ? Value

Part A A Hall-effect probe to measure magnetic field strengths needs to be calibrated in a known magnetic field. Although it is not easy to do, magnetic fields can be precisely measured by measuring the cyclotron frequency of protons. A testing laboratory adjusts a magnetic field until the proton's cyclotron frequency is 9.70 MHz . At this field strength, the Hall voltage on the probe is 0.546 mV when the current through the probe is 0.143 mA . Later, when an unknown magnetic field is measured, the Hall voltage at the same current is 1.740 mV . What is the strength of this magnetic field? Express your answer with the appropriate units. HA ? Value

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter24: Magnetic Fields

Section24.2: Forces Caused By Magnetic Fields

Problem 33SSC

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