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Q.

A heating element using nichrome connected to a 230 V supply draws an initial current of 3.2 A which settles after a few seconds to a steady value of 2.8 A. What is the steady temperature of the heating element if the room temperature is 27.0°C ? Temperature coefficient of resistance of nichrome averaged over the temperature range involved is 1.70x10-4C-1 ?

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a

680°C

b

867°C

c

920°C

d

750°C

answer is B.

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Detailed Solution

R27=VI=2303.2,Rθ=2302.8R27Rθ=R0(1+α×27)R0(1+α×θ)
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