resistivity=2.8*10^-8
so
resistance=1.5/0.54
=2.778 ohm.so,
2.778=(2.8*10^-8*l)/(0.25*3.142*(6*10^-4)^2)
=28.0558 m
b)resistace will become half=1.389 ohm
so current=1.5/1.389
=1.08 A
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