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Drift Velocity

Even though t...

Question

Even though the electron's drift speed and charge are so small, what is the main reason behind large amount of current in conductors?

A

Number of electrons is very high

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B

Free electron's number density is enormous

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C

Electrons are very light

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D

Due to repulsion electrons travel at high speed

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Solution

The correct option is B Free electron's number density is enormous
$i = n e A v_{d}$
$\frac{i}{e A v_{d}} = n$
$i \propto n$
The number density of electrons is very high which makes the current very high.

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