Three wires of copper,iron,and nickel are joi | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) Let $E_{12}$ be the thermo-emf generated by the junction pair $(1, 2)$ and $E_{23}$ be the thermo-emf generated by the junction pair $(2, 3)$.Acco

Vedclass · Accepted Answer

$25$

Vedclass · Answer

(D) Let $E_{12}$ be the thermo-emf generated by the junction pair $(1, 2)$ and $E_{23}$ be the thermo-emf generated by the junction pair $(2, 3)$.According to the law of intermediate temperatures in thermoelectric circuits,the total emf $E$ in the circuit is the algebraic sum of the emfs generated by individual junctions.When junction $1$ is at $50\,^{\circ}	ext{C}$ and junctions $2$ and $3$ are at $0\,^{\circ}	ext{C}$,the deflection is proportional to the emf $E_{12} = 14$ divisions.When junction $3$ is at $50\,^{\circ}	ext{C}$ and junctions $1$ and $2$ are at $0\,^{\circ}	ext{C}$,the deflection is proportional to the emf $E_{23} = 11$ divisions.When junction $2$ is at $50\,^{\circ}	ext{C}$ and junctions $1$ and $3$ are at $0\,^{\circ}	ext{C}$,the circuit effectively acts as two thermocouples in series,where the emf generated is the sum of the emfs of the two junctions,i.e.,$E = E_{12} + E_{23}$.Therefore,the total deflection is $14 + 11 = 25$ divisions.

Similar Questions

$A$ coil takes $15\,min$ to boil a certain amount of water,and another coil takes $20\,min$ for the same process. What is the time taken to boil the same amount of water when both coils are connected in series?

Two bulbs of $500\, W$ and $200\, W$ are manufactured to operate on a $220\, V$ line. What is the ratio of heat produced in the $500\, W$ bulb to the $200\, W$ bulb when they are connected in parallel,and when they are connected in series?

For what value of the resistor $X$ will the equivalent resistance of the two circuits shown be the same?

$A$ wire of $20 \Omega$ is immersed in ice. If $10 \ A$ current is passed through this wire for $1 \ minute$,the ice completely melts. The mass of the ice is nearly $(L_{\text{ice}} = 79.7 \ cal \ g^{-1})$

Two $220\; V, 100\; W$ bulbs are connected first in series and then in parallel. Each time the combination is connected to a $220\; V\; AC$ supply line. The power drawn by the combination in each case respectively will be

Vedclass Test Series

Exam Paper Generator

Online Exam Module