A flat ribbon of silver having a thickness t = 0.200 mm is used in a Hall-effect measurement of a uniform magnetic field perpendicular to the ribbon, as shown in Figure P29.48. The Hall coefficient for silver is RH = 0.840 x 10-10 m3/C.
(a) What is the density of charge carriers in silver?
(b) If a current I = 20.0 A produces a Hall voltage 0VH = 15.0 +V, what is the magnitude of the applied magnetic field?

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