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What conclusion can you draw from the fo...

What conclusion can you draw from the following observations on a resistor made of alloy manganin?
`{:("Current","Voltage","Current","Voltage"),(A,V,A,V),(0.2,3.94,3.0,59.2),(0.4,7.87,4.0,78.8),(0.6,11.8,5.0,98.6),(0.8,15.7,6.0,118.5),(1.0,19.7,7.0,138.2),(2.0,39.4,8.0,158.0):}`

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