The resistance of a bulb filament is 100...

The resistance of a bulb filament is `100 Omega` at a temperature of `100^@C`. If its temperature coefficient of resistance be `0.005 per ^@C`, then its resistance will become `200 Omega` at a temperature:

A

`500 ^@C`

B

`300^@C`

C

`200^@C`

D

`400^@C`

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