A patient with a pacemaker is mistakenly being scanned for, Ask an Expert

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A patient with a pacemaker is mistakenly being scanned for an MRI image. A 10.0 cm long section of pacemaker wire moves at a speed of 10.7 cm/s perpendicular to the MRI unit's magnetic field and a 21.0 mV Hall voltage is induced. What is the magnetic field strength?

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