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