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    (Original post by bobsyouruncle98)
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    Can you post the full question please?

    The way the diagram is drawn makes no sense. Unless the RH end of the wire (potentiometer?) is referenced to the supply -ve terminal (forming a potential divider), the voltage measured will be a straight flat line. i.e. the full supply voltage will be measured at all points along the length of the wire.

    If the RH end of the wire is connected to the supply -ve terminal, then:

    If the resistance of the wire is linear, the accompanying graph is incorrect as it should be a straight line with a gradient.

    The way the accompanying graph is drawn, implies the resistance of the wire is non-linear and follows a logarithmic characteristic.
 
 
 
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