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
• B. Free electron's number density is enormous
• C. Electrons are very light
• D. Due to repulsion electrons travel at high speed

Answer 1

The correct option is B Free electron's number density is enormous

$i=neA{v}_d$
$\frac{i}{eA{v}_d}=n$
$i\propto n$
The number density of electrons is very high which makes the current very high.