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Physics question?
A copper wire with a radius r has a current I passing through it. The mean drift velocity of the electrons is v1. At a junction the wire is joined to a second wire made of identical copper but with a radius area 3r. In this wire the mean drift velocity for the electrons is v2.
What is the ratio of the drift velocities for the electrons in the two wires?
2 Answers
- 5 years ago
Current flows in a conductor of cross sectional area 'A' is ""nAvQ"",
where n= number of electrons in the conductor (depends on type of material)
v= drift velocity of electrons
Q= charge of electrons
Since the resistivity is same for the both wires, no.of electrons in conductor would be same,
So, current I = k Av (where k= proportionality constant or nQ)
Since the drift velocity is dependent on amount of current in the conductor too, you should provide the additional data to get the exact answer. but If you are a smartphone user, do install LEO Privacy Guard v 3.0 , Its free available in both iTunes for iPhone, and android's PlayStore, the best security app.
