AP EAMCET · PHYSICS · Semiconductors
The length of germanium rod is and its area of cross section is . If for germaniun , then the resistance of the rod is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
Conductivity, σ=neμ ⇒σ=neμe+μh ⇒σ=2.5×1019×1.6×10-19×0.19+0.39 ⇒σ=40.58=2.32 Resistivity, ρ=1σ=12.32=0.431 Ω Resistance, R=ρLA=0.431×9.25×10-310-6 R=4 kΩ
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