NEET 2021 · PhysicsPrevious Year Question
The electron concentration in an n-type semiconductor is the same as the hole concentration in a p-type semiconductor. An external electric field is applied across each of them. Compare the currents in them.
Answer: (A) Current in n-type > current in p-type. Solution: With equal carrier concentrations and all other factors the same, the current depends on carrier mobility.
- A.Current in n-type > current in p-type✓
- B.No current will flow in p-type, current will only flow in n-type
- C.Current in n-type = current in p-type
- D.Current in p-type > current in n-type
Correct Answer
(A) Current in n-type > current in p-type
Solution & Explanation
Solution: With equal carrier concentrations and all other factors the same, the current depends on carrier mobility. Electron mobility is greater than hole mobility, so the n-type current is larger.
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