(A) The thermo $e.m.f.$ $(E)$ produced in a thermocouple is given by the relation $E = at + \frac{1}{2}bt^2$,where $t$ is the temperature difference b

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Depends on the nature of metals

(A) The thermo $e.m.f.$ $(E)$ produced in a thermocouple is given by the relation $E = at + \frac{1}{2}bt^2$,where $t$ is the temperature difference between the junctions.Here,$a$ and $b$ are constants that depend solely on the nature of the metals used to form the thermocouple.Therefore,the thermo $e.m.f.$ depends on the nature of the metals and the temperature difference between the junctions,not on the length or cross-section of the wires.

Class 12 Physics Current Electricity Mix Examples-Current Electricity

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Which of the following statements is true regarding the thermo $e.m.f.$ of a thermocouple?

A
Depends on the nature of metals
B
Depends only on the temperature of the cold junction
C
Depends only on the temperature of the hot junction
D
Depends on the length of the wires used for the thermocouple

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The variation of current $(I)$ and voltage $(V)$ is as shown in figure $A$. The variation of power $P$ with current $I$ is best shown by which of the following graphs?

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$A$ current of $0.1 \,A$ flows through a $25 \,\Omega$ resistor as shown in the circuit diagram. The current in the $80 \,\Omega$ resistor is ........... $A$.

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The $V-i$ graphs for a conductor at temperatures $T_1$ and $T_2$ are shown. $(T_2 - T_1)$ is proportional to:

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The electrochemical equivalent of a substance is numerically equal to the mass of the substance deposited if a current $I$ flows through the electrolyte for $0.25\,s$. The value of $I$ is ................ $A$.

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For a thermocouple,the neutral temperature is $270\,^\circ C$ and the temperature of its cold junction is $20\,^\circ C$. If there is no deflection in the galvanometer,the temperature of the hot junction should be .............. $^\circ C$

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Which of the following statements is true regarding the thermo $e.m.f.$ of a thermocouple?

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The variation of current $(I)$ and voltage $(V)$ is as shown in figure $A$. The variation of power $P$ with current $I$ is best shown by which of the following graphs?

$A$ current of $0.1 \,A$ flows through a $25 \,\Omega$ resistor as shown in the circuit diagram. The current in the $80 \,\Omega$ resistor is ........... $A$.

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