A thermocouple of negligible resistance produces an EMF of 40`mu`V`/^0`C in the linear range of temperature .A galvanometer of resistance 10 ohm whose sensitivity is 1 `mu`A/div is employed with the thermocouple .The smallest value of temperature difference that can be detected by the system will be

A thermocouple of negligible resistance produces an emf fo 40 mu V//^(@)C in the linear range of temperature. A galvanometer of resistance 10 Omega whose sensitivity is 1 mu A//div is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will

E.M.F. of a thermocouple is 25 uV//.^(@)C A galvanometer whose resistance is 40omega, reads, 10^(-1)A curren then minimum temperature which is determined by if will be

The constant of a constantan-copper thermocouple is: 4.3xx10^(-2)mV//K . The resistance of the thermocouple is 0.5 ohm, that of the galvanometer 100 ohm. One junction of the thermocouple is immersed in melting ice, the other in a hot liquid. What is its temperature if the current in the circuit is 56muA ?

In the circuit shown the resistance R is kept in a chamber whose temperature. is 20^(@) C which remains constant. The initial temperature and resistance of R is 50^(@)C and 15 Omega respectively. The rate of change of resistance R with temperature is (1)/(2)Omega//^(@)C and the rate of decrease of temperature of R is In (3//100) times the temperature difference from the surrounding (Assume the resistance R loses heat only in accordance with Newton's law of cooling) If K is closed at t = 0, then find the (a) value of. R for which power dissipation in it is maximum. (b) temperature of R when power dissipation is maximum (c) time after which the power dissipation will be maximum

Near room t emperature, the thermo emf of a copper constantan couple is 40 muV per degree. What is the smallest temperature difference that can be detected with a single such couple and a galvanometer of 100 ohm resistance capable of detecting current as low 10^(-6) ampere?

In the following circuit a 10 m long potentiometer wire with resistance 1.2 ohm/m, a resistance and an accumulator of emf 2V are connected in series. When the emf of thermocouple is 2.4 mV then the deflection in galvanometer is zero. The current supplied by the accumulator will be:

A galvanometer of resistance 10Omega shows full scale deflection for current 100 mA. The resistance that needs to be connected in series with the galvanometer so that it can be used to measure potential difference in the range 0-100 V is (in Ohm):

An accumulator of emf 2 V and negligible internal resistance is connected across a uniform wire of length 10 m and resistance 30 Omega The appropriate terminals of a cell of emf 1.5 V and internal resistance 1 Omega is connected to one end of the wire and the other terminal of the cell is connected through a sensitive galvanometer to a slider on the wire. What is the length of the wire that will be required to produce zero deflection of the galvanometer? How will the balancing length change? (a) When a coil of resistance 5Omega is placed in series with the accumulator. (b) The cell of 1.5 V is shunted with 5 Omega resistor?

The emf varepsilon of a Cu-Fe thermocouple varies with the temperature theta of the hot junction (cold junction at 0^(@)C ), as varepsilon(mu V)=14 theta-0.02 theta^(2) Determine the neutral temperature.

A comon flashlight bulb is rated 0.30A and 2.7V (the values of the current and voltage under operating conditions.) If the resistance of the tungsten bulb filament at room temperature 20^(@)C is 1.0Omega and its temperature coefficient of resistivity is 4.0 xx 10^(-3)C^(-1) , then find the temperature in centigrade of the filament when the bulb is on. (Consider the variationi of resistance to be linear with temperature.)