Question

estion Paper (Section Wise)
Q.1 The temperature coefficient of resistance of platinum is a m3 92 10-*** at 20°c Find the temperature at which the increase in the resistance of platinum wire is 10% of it's value at 20°c​

Answer 1

Answer:

Resistance at 20

o

Cis1Ω

Increase in temperature, ΔR=10Ω

ΔR=αR

20

ΔT=

⇒10=3.92×10

−1

×1×(T−20)

⇒T=45.5

o

C

Hence, at 45.5

o

C resistance increased by 10Ω

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