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The resistance of wire in a heater at room temperature is 65Ω. When the heater is connected to a 220V supply the current settles after a few seconds to 2.8A. What is the steady temperature of the wire. (Temperature coefficient of resistance α = 1.70 × 10−4∘C−1)
  • a)
    955C
  • b)
    1055C
  • c)
    1155C
  • d)
    1258C
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The resistance of wire in a heater at room temperature is 65Ω. W...
Here, T1 = 27C, R1 = 65Ω
R2
= Supply voltage / Steady current
= 220 / 2.8
= 78.6Ω
Now, using the relation
R2 = R1[1 + α(T2 − T1)]
∴ 

T2 − T1 = 1231
T2 = 1231 + T1 = 1231 + 27
= 1258C
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Most Upvoted Answer
The resistance of wire in a heater at room temperature is 65Ω. W...
Ohms. This information alone is not enough to make any calculations or predictions about the heater's performance. Additional information about the heater's design, power rating, and other factors would be necessary.
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The resistance of wire in a heater at room temperature is 65Ω. When the heater is connected to a 220V supply the current settles after a few seconds to 2.8A. What is the steady temperature of the wire. (Temperature coefficient of resistance α = 1.70 × 10−4C−1)a)955Cb)1055Cc)1155Cd)1258CCorrect answer is option 'D'. Can you explain this answer?
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