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## Main Question or Discussion Point

Does Ohms Law have practical limits?

For example:A piece of steel wire of length of length 10um and of CSA 20E-10.

Can we calculate the resistance of such a tiny piece of wire (resistor) in the usual way?

thanks

For example:A piece of steel wire of length of length 10um and of CSA 20E-10.

Can we calculate the resistance of such a tiny piece of wire (resistor) in the usual way?

thanks