A wire must be replaced in a circuit by a new wire of the same material but nine times longer. If the new wire's resistance is the same as the original wire's, what is the diameter of the new wire?
O the same as the original diameter
O one half the original diameter
O one third the original diameter
O three times the original diameter
O nine times the original diameter
Answers: 1
is the electrical resistivity of the material and R is the resistance of the wire. We have 
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A wire must be replaced in a circuit by a new wire of the same material but nine times longer. If th...
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