D. C. Pandey Solutions for Chapter: Current Electricity, Exercise 4: Objective Problems [ Level 1 ]

Consider four circuits shown in the figure below. In which circuit power dissipated is greatest? (Neglect the internal resistance of the power supply)

The terminal potential difference of a cell is greater than its emf when it is

The internal resistances of two cells shown are $0.1 \mathrm{\Omega }$ and $0.3 \mathrm{\Omega }$. If $R=0.2 \mathrm{\Omega }$, the potential difference across the cell

How much work is required to carry a $6 \mu \mathrm{C}$ charge from the negative terminal to the positive terminal of a $9 \mathrm{V}$ battery?

The $n$ rows each containing $m$ cells in series are joined in parallel. Maximum current is taken from this combination across an external resistance of $3 \mathrm{\Omega }$ resistance. If the total number of cells used are $24$ and internal resistance of each cell is $0.5 \mathrm{\Omega },$ then

If $E$ is the $\mathrm{emf}$ of a cell of internal resistance $r$ and external resistance $R$, then potential difference across $R$ is given as

When $n$ cells are joined in parallel combination as shown, the strength of the current $i$ is given by

Two cells of the same EMF $E$ but different internal resistances $r_1$ and $r_2$ are connected in series with an external resistance $R$ as shown in the figure. The terminal potential difference across, the second cell is found to be zero. The external resistance $R$ must then be: