Question
Question: A block of pure silicon at 300 K has a length ofj 10 cm and an area of \(1.0cm^{2}\) A battery of EM...
A block of pure silicon at 300 K has a length ofj 10 cm and an area of 1.0cm2 A battery of EMG 2 V is connected across it. The mobility of electons is 0.14m2V−1s−1 and their number density is the electrons current is.
A
6.72×10−4A
B
6.72×10−5A
C
6.72×10−6A
D
6.72×10−7A
Answer
6.72×10−7A
Explanation
Solution
: As E=lV=0.1m2V=20Vm−1
A=1.0cm2=1.0×10−4m2
ve=μeE=0.14×20=2.8ms−1
The electron current is
}{= (1.5 \times 10^{16}) \times (1.0 \times 10^{- 4}) \times (1.6 \times 10^{- 19}) \times 2.8 }{= 6.72 \times 10^{- 7}A}$$