A electric current of 16 A exists in a metal wire of cross section 10 − − 6 m 2 and length 1m. Assuming one free electrons per atom. The drift speed of the free electrons in the wire will be (Density of metal = 5 × × 10 3 kg/m 3 , atomic weight = 60)
Text Solution
Verified by ExpertsThe correct answer is:
B
According to Avogadro's hypothesis 
so n = 
N A 
Hence total number of atoms n = 
= 5 × × 10 28 /m 3
Hence drift velocity v d = 
= 
= 2 × × 10 − − 3 m/s.
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