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Consider a wire with electrons flowing through it, if you wa

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by

Richard Datwyler

on 1 March 2016

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Transcript of Consider a wire with electrons flowing through it, if you wa

Consider a wire with electrons flowing through it, if you wanted to count how many cross a section you would get:
Current
and
Current Density

I
I
J
J
but if it narrows, more charge must be moving in a specific area, this is charge density
The current is constant in a wire.
An electric field of 0.0075 V/m is in a wire with a resistivity . What is the current density and current if the wire has a diameter of 1 mm?
A 2 mm diameter Silver wire has a drift speed of 0.15 mm/s, what is the Current in this wire?
A 1.5 mm diameter 1 m long Silver wire has a potential of 30 mV put across it, what is the current in the wire?
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