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The resistance of a bulb filmanet is 100Ω at a temperature of 100°C. If its temperature coefficient of resistance be 0.005 per °C, its resistance will become 200 Ω at a temperature of
  • a)
    300°C
  • b)
    400°C
  • c)
    500°C
  • d)
    200°C
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The resistance of a bulb filmanet is 100Ω at a temperature of 10...
R1 = R0 [1 + α × 100] = 100 ....(1)
R2 = R0 [1 +α × T] = 200 ....(2)
On dividing we get
NOTE : We may use this expression as an approximation because the difference in the answers is appreciable.
For accurate results one should use R = R0eαΔT
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The resistance of a bulb filmanet is 100Ω at a temperature of 100°C. If its temperature coefficient of resistance be 0.005 per °C, its resistance will become 200 Ω at a temperature ofa)300°Cb)400°Cc)500°Cd)200°CCorrect answer is option 'B'. Can you explain this answer?
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