The Hall Affect Is Used to Measure the Carrier Density

question 30

Multiple Choice

The Hall affect is used to measure the carrier density of a thin sheet of electrons.When a current flows through the length of the electron sheet,which is 1.2-mm long,0.27-mm wide and 12-nm thick,a magnetic field of 0.75 T perpendicular to the sheet produces a potential difference of 0.53 mV across the width of the sheet.If the carrier density in the electron sheet is 8.49 * 10²⁸ m^-3,what current flows through the length of the sheet?

• A)0.12 A
• B)1.25 A
• C)0.80 A
• D)0.36 A
• E)0.56 A

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