Hall Probe Is a Device Widely Used for Measuring Magnetic

Hall probe is a device widely used for measuring magnetic field strengths.One Hall probe consists of a current carrying strip of bismuth that is 0.20 mm thick and 4 mm wide.The charge carrier density of bismuth is 1.35 * 10²⁵ m^-3.When the strip is placed in a magnetic field perpendicular to the direction of 2.1-A current,it develops a Hall voltage of 3.5 mV across the strip.The strength of the magnetic field is

A) 72 T.
B) 8 T.
C) 1.5 T.
D) 0.72 T.
E) 21 mT.

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