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A cube of Diamond with sides s=1.2cm has a voltage V=40V applied to two opposite sides (both sides fully
covered in metal). An ammeter tells us there is a current of 0.5 mA. A subsequent Hall Effect measurement with
a current of 5 microamps and a magnetic field of 1mT gives us ɛn=3.12E6 V/cm. Find the lifetime of the carriers
in the sample.

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