If the emf e developed in a thermocouple for the temperature t ° C of its hot junction with cold junction remaining at 0 ° C is given by e = a t + 1 2 b t 2 . Where a = 14 μ V / C ∘ and b = 0 . 04 μ V / C ∘ 2 , then on increasing the temperatures of hot junction-

no inversion temperature will be obtained

no thermoclectric current will be produced

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12th West Bengal Board

IMPORTANT

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As the temperature of the hot junction increases the thermo emf.

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Important Questions on Thermal Effect and Chemical Effect of Current

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 56

The thermo-emf of a thermocouple is

25 μ V / {}^{\circ}C

at room temperature. A galvanometer of

40 Ω

resistance, capable of detecting current as low as

10^{- 5} A

, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is.

HARD

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 57

If the emf

e

developed in a thermocouple for the temperature

t^{°} C

of its hot junction with cold junction remaining at

0 ° C

is given by

e = a t + \frac{1}{2} b t^{2}

. Where

a = 14 μ V / {}^{\circ}C

and

b = 0.04 μ V / {{}^{\circ}C}^{2}

, then on increasing the temperatures of hot junction-

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 58

For a thermocouple, the inversion temperature is

600^{°} C

and the neutral temperature is

320^{°} C

. Find the temperature of cold junction

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 59

The thermo-emf of a thermocouple is

25 μ V / {}^{\circ}C

at room temperature. A galvanometer of

40 Ω

resistance, capable of detecting current as low as

10^{- 5} A

, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is.

MEDIUM

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 60

The thermocouple among the following that can produce maximum thermo-emf for the same temperature difference between the junctions is

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 61

A thermocouple is made from two metals, antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold, then, an electric current will

EASY

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 62

If the cold junction is held at

0 ° C

, the thermos-emf

V

Of a thermocouple varies as

V = 10 \times 10^{- 6} t - \frac{1}{40} \times 10^{- 6} t^{2}

, where

t

Is the temperature of the hot junction is

{}^{\circ}C

. The neutral temperature and maximum value of thermos-emf are

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 63

Consider the following statements A and B and identify the correct answer given below :

(A) Peltier co-efficient is numerically equal to the potential difference across the junctions of the thermocouple through which current is flowing.

(B) According to Thomson, energy is neither absorbed nor evolved at the junction of a thermocouple but is absorbed lived only along the length of both the conductors.

As the temperature of the hot junction increases the thermo emf.

Important Questions on Thermal Effect and Chemical Effect of Current

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