Question

For the circuit shown in fig. four cells are arranged. In Column I, the cell number is given, while in Column II, some statements related to cells are given. Match the entries of Column I with the entries of Column II.

Answer 1

We have $I_1=-\frac{1}{20}A,I_2=\frac{7}{20}A,I_3=-\frac{6}{20}A$.

In each cell, thermal energy will be dissipated due to internal resistance whether the chemical energy of the cell is increasing or decreasing.

i. Cell I is getting charged, hence its chemical energy increases.

ii. Cells II and III both are getting discharged, hence their chemical energies are decreasing. So work done by both of them is positive.

iv. Cell IV is getting charged, hence its chemical energy increases.