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

গতিশীলতা এবং পরিবাহিতা নীচের কোন সমীকরণের সাথে সম্পর্কিত?

1
d = NUσ
2
σ = NeU
3
N = σU/e
4
U = σe/N
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