a coil of copper wire has a resistance of 10 ohms at 20 degrees celcius. if the temperature coefficient of resistance of copper at 20 degrees celcius is 0.004/degree celcius determine the resistance of the coil when the temperature rises to 100 degrees celcius
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Explanation:
Given,
R
T
=4.2ohm
T=100
0
C
α=0.004/
0
C
T
0
=0
0
C
ΔT=T−T
0
=100−0=100
0
C
The resistance, R
T
=R
0
(1+αΔT)
R
0
=
(1+αΔT)
R
T
R
0
=
(1+0.004×100)
4.2
=3Ω
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