Acurrent of i=8.0a is flowing in a typical extension cord of length l=3.00m. the cord is made of copper wire with diameter d=1.5mm. the charge of the electron is e=1.6×10−19c. the mass of the electron is me=9.1×10−31kg. the resisitivity of copper is rho=1.7×10−8ω⋅m. the concentration of free electrons in copper is n=8.5×1028m−3.

find the drift velocity vd of the electrons in the wire

Explanation: Drift velocity is the velocity attained by the chaged particles in a material due to an electric field.

Most electrical signals carried by currents travel at speeds on the order of , a significant fraction of the speed of light.

Mathematically, we have:

....................................(1)

where:

Given:

Asked:

Firstly, we find area:

Now, putting the required values in eq. (1)

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a and c

c is 100% but i am confused in a