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In Hall effect measurements a plate of width \( h=10 \mathrm{~mm} \) and length \( I=50 \mathrm{~mm} \) made of \( p \)-type semiconductor was placed in a magnetic field with induction \( B=5.0 \mathrm{kG} \). A potential difference \( V=10 \mathrm{~V} \) was applied across the edges of the plate. In this case the Hall field is \( V_{H}=50 \mathrm{mV} \) and resistivity \( \rho=2.5 \Omega \cdot \mathrm{cm} \). Find the concentration of holes and hole mobility.
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