when the resistance wire is passed through a die the cross section area decreases by 1% the change in resistance of the wire is ...????
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Answered by
9
The resistance of a material is given by :- (Resistivity * Length)/(Area of Cross section).
Hence, when length is increased by a factor ; then the resistance will also increase proportionately.
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Answered by
14
In case of very small change <2%
Percentage change in resistance = -2 x change in area.
So answer of this question will be : - 2x1%=2% (- sign fir decrement)
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