Asok Kumar Das and Chittaranjan Dasgupta Solutions for Chapter: Thermal Effect and Chemical Effect of Current, Exercise 1: EXERCISE 6

Two conductors, one having resistance R and another $2R$ are connected in turn across a d.c. source. If the rate of heat produced in the two conductors is $Q_1$ and $Q_2$ respectively, what is the value of $\frac{Q_1}{Q_2}$ ?

Does in electrolysis the mass of electrodes always change?

If a steady current flows for an indefinite time through a resistor, will its temperature continue to increases indefinitely. Explain with reason. 

Explain why electric lamp used in d.c. line can also be used in a.c. line.

It is advisable to measure temperature more than the neutral temperature by thermocouple. Why?

How would you determine which is positive and which is negative terminals of voltaic battery by electrochemical effect of current?

The thermo-emf of a thermocouple is $25\mu \mathrm{V}/{}^{\circ }\mathrm{C}$ at room temperature. A galvanometer of $40\Omega$ resistance, capable of detecting current as low as ${10}^{-5} \mathrm{A}$, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is.

The thermo-emf of a thermocouple is $25\mu \mathrm{V}/{}^{\circ }\mathrm{C}$ at room temperature. A galvanometer of $40\Omega$ resistance, capable of detecting current as low as ${10}^{-5} \mathrm{A}$, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is.