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A carbon filament has resistance of 120O...

A carbon filament has resistance of `120Omega` at `0^(@)C` what must be te resistance of a copper filament connected in series with resistance at all temperature
`(alpha_("carbon")=(-5xx10^(-4))/(``^(@)C),alpha_("copper")=(4xx10^(-3))/(``^(C))`

A

`120Omega`

B

`15Omega`

C

`60Omega`

D

`210Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
`R_(1)alpha_(1)=R_(2)alpha_(2)`
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