railway RRB Technician Grade 1 Mock Test 2024 Electronic Devices Carriers in Semiconductors Extrinsic Fermi Level

n-টাইপ অর্ধপরিবাহীর সংখ্যালঘু বাহক হল:

1
ইলেকট্রন
2
গর্ত 
3
অবস্থান 
4
প্রোটন
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