carbon resistor has resistance 100 ohm at 0°C .What must be the resistance of copper resistor placed in series with it such that the combination has same resistance at all temperature
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Answer:
R
ca
=R
ca
0
(1+α
ca
ΔT)
R
cu
=R
cu
0
(1+α
cu
ΔT)
R
ca
+R
cu
=R
ca
0
+R
cu
0
+ΔT(R
ca
0
α
ca
+R
cu
0
α
cu
)
⇒R
ca
+R
cu
is independent of temperature
⇒R
ca
0
α
ca
+R
cu
0
α
cu
=0
120×7×10
−4
=R
cu
0
×4×10
−3
R
cu
0
=21
Explanation:
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