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# AS Physics: Current and Charge Free Electrons Drift Velocity watch

1. 11. If the density of a metal is kgm^-3 and 84.6kg of this metal contains atoms,

a) find the number of 'free' electrons per cubic metre of the metal assuming that each metal atom has one 'free' electron

b) how many 'free' electrons will there be in a 1.0m length of wire made from this metal of cross-sectional area 1.0 mm^2

c)what is the total charge of the free electrons per metre of the wire

d) assuming that these 'free' electrons are responsible for conduction, how long will the charge in (c) take to travel 1m when a current of 3.0A flows?

e) what is the drift velocty of the 'free' electrons

!! I know this is long, but some help is appreciated! full solutions are not really going to help me, so just help me in where to start

thanks
2. anyone?
3. almost 10 years later but is the answer to the first one 8.5*10^26?
doing some revision for my a levels and using this question as practise
4. *8.5*10^28

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