The temperature coefficient of resistance of a wire is 0.00125/`""^(@)C`. Its resistance is 1 ohm at 300 K. its resistance will be 2 ohm at

Options

A. 1127 K
B. 1400K
C. 1154K
D. 1100K

Answer

A

Explanation

`R=R_(0)(1+betat)`
`therefore (R_(1))/(R_(2))=(1+betat_(1))/(1+betat_(2))`
`(1)/(2)=(1+0.00125xx27)/(1+0.00125t_(2))impliest_(2)=854^(@)C`
`854+273=1127K`.