E.M.F. of a thermocouple is 25 mV//.^(@...

E.M.F. of a thermocouple is 25 `mV//.^(@)C` A galvanometer whose resistance is 40W, reads, `10^(-5)A` curren then minimum temperature which is determined by if will be

`8^(@)C`

`12^(@)C`

`16^(@)C`

`20^(@)C`

Text Solution

Verified by Experts

Topper's Solved these Questions

CIRCULAR MOTION
ALLEN|Exercise EXERCISE (J-A)|6 Videos
GEOMETRICAL OPTICS
ALLEN|Exercise subjective|14 Videos

Similar Questions

Explore conceptually related problems

The themo emf of a copper-constantan thermocouple is 40muV.^(@)C^(-1) at room temperature. A galvanometer whose resistance is 80 Omega and current sensitivity 1 muA is used. Find the smallest temperature difference that the galvanometer can detect.

The thermo e.m.f. of a thermo- couple is 25 muV//^@C at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as 10^(-5) A, is connected with the thermo couple. The smallest temperature difference that can be detected by this system is

The thermo emf of a thermocouple is 40 mu V K^(-1) at room temperature. A galvanometer of resistance 100 Omega capable of detecting current as law as 10 muA is connected with one such thermocouple. Calculate the smallest temperature difference that can be detected by such a thermocouple.

A platinum resistance thermometer reads 0^@ C when its resistance is 80 Omega and 100^@ C when its resistance is 90 Omega . Find the temperature at which the resistance is 86 Omega .

A piece of copper wire has a resistance of 25 Omega at 10^(@)C . What is the maximum operating temperature, if the resistance of the wire is to be increased by 20 % ? (Assume alpha at 10^(@)C=0.0041// .^(@)C^(-1) ).

The cold junction of a thermocouple is maintained at 10^(@)C . No thermo e.m.f . is developed when the hot junction is maintained at 530^(@)C . The neutral temperature is

The cold junction of a thermocouple is at 0^(@)C . The thermo e.m.f. epsilon , in volts, generated in this thermocouple varies with temperature t^(@)C of the hot junction as epsilon=6+4t-(t^(2))/(32) . The neutral temperature of the thermocouple

Near room temperature , the thermo emf of a thermo couple is 40 muV per degree. A galvanometer of 25 Omega and capable of detecting current of the order of 4 mu A is used. Calcualate the smallest temperature difference that can be detected with this galvanometer.

In the primary circuit of a potentiometer, a cell of E.M.F 1 V and a rheostat of 15 Omega are connected in series. If the resistance of the potentiometer wire is 10 Omega the minimum voltage at the ends of the wire (in V) will be

A thermocouple of resistance 1.6 Omega is connected in series with a galvanometer of 8 Omega resistance. The thermocouple develops and e.m.f. of 10 mu V per degree temperature difference between two junctions. When one junction is kept at 0^(@)C and the other in a molten metal, the galvanometer reads 8 millivolt . The temperature of molten metal, when e.m.f. varies linearly with temperature difference, will be

ALLEN-CURRENT ELECTRICITY-All Questions

An electric kettle takes 4 A current at 220 V. How much time will it t...
Text Solution
|
A thermoelectric refrigerator works on
Text Solution
|
E.M.F. of a thermocouple is 25 mV//.^(@)C A galvanometer whose resist...
Text Solution
|
At neutral temperature, the thermoelectric power ((dE)/(dT)) has the v...
Text Solution
|
In producing chrlorine through electorlysis, 100 kW power at 125 V is ...
Text Solution
|
The thermo e.m.f. E in volts of a certain thermocouple is found to var...
Text Solution
|
A light bulb is rated 100W for a 220V supply. The resistance of the bu...
Text Solution
|
The rate of increase of thermo-emf with temperature at the neutral tem...
Text Solution
|
A thermocouple of negligible resistance produces an emf fo 40 mu V//^(...
Text Solution
|
The cold junction of a thermocouple is at 0^(@)C. The thermo e.m.f. ep...
Text Solution
|
If voltage across a bulb rated 220 volt-100 watt drops by 2.5 % of its...
Text Solution
|
The power dissipated in the circuit shown in the is 30 watts. The valu...
Text Solution
|
In the electroplating of silver,AgNO(3) solution is usually used as an...
Text Solution
|
The amount of substance liberated on electrodes during electrolysis wh...
Text Solution
|
All bulbs in figure below are identical which, bulbs light most bright...
Text Solution
|
The true statement for thermo e.m.f . of a thermocouple
Text Solution
|
Your are given resistance wire of length 50 cm and a battery of neglig...
Text Solution
|
A factory is served by a 220 V supply line. In a circuit protected by ...
Text Solution
|
A copper refining cell consists of two parallel copper plate electrode...
Text Solution
|
The resistance of hot tungsten filament is about 10 times the cold res...
Text Solution
|