Q3: An-type semiconductor crystal with 12 mm long ,5mm wide and Imm thick has magnetic density of 0.5 wb/m? applied perpendicular on the semiconductor , when current of 20 m A flows length wise through it the hall coefficient is 3.7 x10 6 m/c 1-find concentration of electrons 2-Hall voltage 3- Mobility of electrons if the conductivity is 112/2m

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