Question

A potential difference of 2.5 V is applied across the faces ofa germanium crystal plate. The face area of the crystal is 1 cm2 and its thickness is 1.0 mm. The free electron concentration in germanium is 2 x 1019 m and the electron and holes mobilities are 0.33 m2/N s and 0.17 m2/V s respectively. The current across the plate will be ​

Answer 1

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Answer 2

Answer:

0.64 A

Explanation:

σ = ne ( μe + μh )

  = 2 × 10¹⁹ × 1.6×10⁻¹⁹ ( 0.36 + 0.14 )

  = 1.6(Ω-m)⁻¹

R = ρl/A

  = l/σA

  = 0.5×10⁻³ / 1.6×10⁻⁴

  = 25/8 Ω \ i

  = V/R

  = 2/25/8

  = 16/25 A

  = 0.64 A