PHYS 121 Lecture 15: Magnetism

The electron beam in a cathode ray tube (TV or computer monitor) scans from the left to the right a horizontal line along the screen. When the scan of line is completed the beam is lowered to scan another line. After the most bottom line is scanned, the beam is brought back to the top line. In the US, which accepted the National Television Standards code system, there are 525 horizontal lines on TV which are scanned 30 times a second.Determine the direction of the magnectic fields which control both the horizontal and the vertical deflection of the electron beam.

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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 10.0 cm/s perpendicular to the MRI unit's magnetic field and a 20.0-mV Hall voltage is induced. What is the magnetic field strength?