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A carbon filament has resistance of 120O...

A carbon filament has resistance of 120`Omega` at ` 0^(@)C` what must be the resistance of a copper filament connected in series with carbon so that combi-nation has same resistance at all temperatures
`(alpha_(carbon)=-5 xx 10^(-4)//^(0)C, alpha_(copper)=4 xx 10^(-3)//^(0)C)`

A

`120 Omega `

B

`15 Omega `

C

`60 Omega `

D

`210 Omega `

Text Solution

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The correct Answer is:
B
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