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At room temperature 27°C, the resistance of the heating element. R27° = 230/3.2 = 71.875 ohm At the steady temperature t° C, the resistance Rt = 280/2.8 = 82.143 ohm Now, R2 = R1[1 + α(t2 - t1) => 82.143 = 71.875[1 + 1.7 x 10-4(t - 27)] => 0.0840 x 104 = t - 27 => 840 = t - 27 => t = 867°C
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