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As Temperature Increases, the Viscosity of Liquids Decreases Considerably. Will this Decrease the Resistance of an Electrolyte as the Temperature Increases? - Physics

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प्रश्न

As temperature increases, the viscosity of liquids decreases considerably. Will this decrease the resistance of an electrolyte as the temperature increases?

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उत्तर

Yes, the resistance of the electrolyte will decrease with an increase in temperature. This is because when the temperature of an electrolytic solution increases, its viscosity decreases and mobility of the ions in the solution increases.

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Temperature Dependence of Resistance
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पाठ 11: Thermal and Chemical Effects of Current - Short Answers [पृष्ठ २१७]

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एचसी वर्मा Concepts of Physics Vol. 2 [English] Class 11 and 12
पाठ 11 Thermal and Chemical Effects of Current
Short Answers | Q 9 | पृष्ठ २१७

संबंधित प्रश्‍न

A silver wire has a resistance of 2.1 Ω at 27.5°C, and a resistance of 2.7 Ω at 100°C. Determine the temperature coefficient of resistivity of silver.


The order of coloured rings in a carbon resistor is red, yellow, blue and silver. The resistance of the
carbon resistor is:

a) 24 x 106 Ω ± 5%

b) 24 x 106 Ω ± 10%

c) 34 x 104 Ω ± 10%

d) 26 x 104 Ω ± 5%


Draw labelled graphs to show how electrical resistance varies with temperature for: 

1) a metallic wire.

2) a piece of carbon


Show variation of resistivity of Si with temperature in a graph ?


The thermal energy developed in a current-carrying resistor is given by U = i2 Rt and also by U = Vit. Should we say that U is proportional to i2 or i?


Sometimes it is said that "heat is developed" in a resistance when there is an electric current in it. Recall that heat is defined as the energy being transferred due to temperature difference. Is the statement in quotes technically correct?


As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity ____________ .


The resistance of an iron wire and a copper wire at 20°C are 3.9 Ω and 4.1 Ω, respectively. At what temperature will the resistance be equal? Temperature coefficient of resistivity for iron is 5.0 × 10–3 K–1 and for copper, it  is 4.0 × 10–3 K–1. Neglect any thermal expansion.


Is inversion temperature always double the neutral temperature? Does the unit of temperature have an effect in deciding this question?


Is neutral temperature always the arithmetic mean of the inversion temperature and the temperature of the cold junction? Does the unit of temperature have an effect in deciding this question?


Consider the following statements regarding a thermocouple.
(A) The neutral temperature does not depend on the temperature of the cold junction.
(B) The inversion temperature does not depend on the temperature of the cold junction.


Find the thermo-emf developed in a copper-silver thermocouple when the junctions are kept at 0°C and 40°C. Use the data given in the following table.

Metal with lead (Pb)

a

`mu V"/"^oC`

b

`muV"/("^oC)`

Aluminium -0.47 0.003
Bismuth -43.7 -0.47
Copper 2.76 0.012
Gold 2.90 0.0093
Iron 16.6 -0.030
Nickel 19.1 -0.030
Platinum -1.79 -0.035
Silver 2.50 0.012
Steel 10.8 -0.016

Find the neutral temperature and inversion temperature of a copper-iron thermocouple if the reference junction is kept at 0°C. Use the data given in the following table.

Metal with lead (Pb)

a

`mu V"/"^oC`

b

`muV"/("^oC)`

Aluminium -0.47 0.003
Bismuth -43.7 -0.47
Copper 2.76 0.012
Gold 2.90 0.0093
Iron 16.6 -0.030
Nickel 19.1 -0.030
Platinum -1.79 -0.035
Silver 2.50 0.012
Steel 10.8 -0.016

A metallic wire has a resistance of 3.0 Ω at 0°C and 4.8 Ω at 150°C. Find the temperature coefficient of resistance of its material.


In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is ______.

The specific resistance of all the metals is the most affected by ______


The temperature (T) dependence of resistivity of materials A and material B is represented by fig (i) and fig (ii) respectively. Identify material A and material B.


fig. (i)

fig. (ii)

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