The wires in a house must be large enough in diameter so that they do not get

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The wires in a house must be large enough in diameter so that they do not get hot enough to start a fire. Suppose a certain wire is to carry a current of 20 A, and it is determined that the Joule heating of the wire should not exceed 2 W/m. What diameter must a copper wire have to be safe for this current?

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