Resistance of tungsten wire at 1500C is 133 Ω. Its resistance temperature coefficient is 0.00450C. The resistance of this wire at 5000C will be

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180 Ω

225 Ω

258 Ω

317 Ω

answer is C.

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Detailed Solution

R150R500 = 1+α1501+α500. Putting R150=133Ωα=0.0045/0C, we get R500=258 Ω

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