The temperatures of the junctions of a bismuth-silver thermocouple are maintained at `0^@ C` and `0.001^@ C`. Find the thermo-emf (Seebeck emf) developed. For bismuth-silver, `a = - 46 xx 10^(-6) V^@ C^(-1) and b= -0.48 xx 10^(-6) V^@ C^(-2)`.

Answer

A, D

Explanation

`theta = 0.001^@C`
`a =- 46xx 10^(-6) V//deg`
`b =- 0.48 xx 10^(-5) V//deg^2`
`Emg = a theta +b theta^2`
` = - 46xx10^(-6)xx0.001 - (1)/(2)`
`xx0.48 xx 10(-6)xx((0.001))^2`
`= -46xx10(-9) - 0.24xx 10^(-12)`
` =-46.10^(-9)`
` `
` =- 46.0024xx10(-9)`
`=- 4.6 xx 10^(_8) V`
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