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The resistance of a coil at 100oC is 4.2 Ω. If temperature coefficient of resistance of the coil material is 0.004oC-1, then its resistance at 0oC is

  • a)
    6.5 Ω

  • b)
    5 Ω

  • c)
    3 Ω 

  • d)
    2.5 Ω

Correct answer is option 'C'. Can you explain this answer?
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The resistance of a coil at 100oC is 4.2 Ω. If temperature coeff...
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The resistance of a coil at 100oC is 4.2 Ω. If temperature coeff...
Ohms. What is its resistance at 25oC if its temperature coefficient of resistance is 0.0042/oC?

We can use the formula:

R2 = R1 [1 + α(T2 - T1)]

Where:

R1 = 4.2 Ohms (resistance at 100oC)
T1 = 100oC
T2 = 25oC
α = 0.0042/oC (temperature coefficient of resistance)

Substituting the values, we get:

R2 = 4.2 [1 + 0.0042(25 - 100)]
R2 = 4.2 [1 - 0.3192]
R2 = 4.2 x 0.6808
R2 = 2.86016 Ohms

Therefore, the resistance of the coil at 25oC is approximately 2.86 Ohms.
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The resistance of a coil at 100oC is 4.2 Ω. If temperature coeff...
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The resistance of a coil at 100oC is 4.2 Ω. If temperature coefficient of resistance of the coil material is 0.004oC-1, then its resistance at 0oC isa)6.5 Ωb)5 Ωc)3 Ωd)2.5 ΩCorrect answer is option 'C'. Can you explain this answer?
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The resistance of a coil at 100oC is 4.2 Ω. If temperature coefficient of resistance of the coil material is 0.004oC-1, then its resistance at 0oC isa)6.5 Ωb)5 Ωc)3 Ωd)2.5 ΩCorrect answer is option 'C'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about The resistance of a coil at 100oC is 4.2 Ω. If temperature coefficient of resistance of the coil material is 0.004oC-1, then its resistance at 0oC isa)6.5 Ωb)5 Ωc)3 Ωd)2.5 ΩCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The resistance of a coil at 100oC is 4.2 Ω. If temperature coefficient of resistance of the coil material is 0.004oC-1, then its resistance at 0oC isa)6.5 Ωb)5 Ωc)3 Ωd)2.5 ΩCorrect answer is option 'C'. Can you explain this answer?.
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