At room temperature, copper has free electron density of 8.4×1028m−3. The electron drift velocity in a copper conductor of cross-sectional area of 10−6m2 and carrying a current of 5.4A, will be
0.4ms−1
4cms−1
0.4mms−1
4ms−1
A
4ms−1
B
4cms−1
C
0.4mms−1
D
0.4ms−1
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Solution
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Current density and drift velocity are related by:
J=nevd⇒I=nAevd
Substituting the values, we get:
vd=InAe=5.48.4×1028×10−6×1.6×10−19=4×10−4m/s
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