A straight copper wire of diameter $0.42 \times {10^{ - 3}}m$ has a number density of free electrons of $8.5 \times {10^{28}}{m^{ - 3}}$. In a given time interval, a charge of 0.15 C moves through the wire.
What is the average displacement of the free electrons along the wire in this time interval?
1 )
$3.3 \times {10^{ - 8}}m$
2 )
$2.0 \times {10^{ - 5}}m$
$8.0 \times {10^{ - 5}}m$
4 )
$2.5 \times {10^{ - 4}}m$
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