A copper strip n 8.47 1022 electrons per cubic centimeter, Ask an Expert

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Q. A copper strip (n = 8.47 1022 electrons per cubic centimeter) 2 cm wide and 0.07 cm thick is used to measure the magnitudes of unknown magnetic fields that are perpendicular to the strip. Find the magnitude of B for the following Hall voltages when I = 21 A.

Q. While waiting to cross the street, an ambulance passes by you with a speed of 25 m/s. The siren has a frequency of 900 Hz. What is the drop in frequency as the ambulance passes you? (v=343 m/s)

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