Question

A battery is of emf $E$ is being charged from a charger such that positive terminal of the battery is connected to terminal $A$ of charger and negative terminal of the battery is connected to terminal $B$ of charger. The internal resistance of the battery is $r$, then

• A. Potential difference across points $A$ and $B$ must be more than $E$
• B. $A$ must be at higher potential than $B$
• C. In battery, current flows from positive terminal to the negative terminal
• D. No current flows through battery

Answer 1

Answer: (A), (B), (C)

The correct options are
A Potential difference across points $A$ and $B$ must be more than $E$
B $A$ must be at higher potential than $B$
C In battery, current flows from positive terminal to the negative terminal

A battery is of emf E is being charged from a charger and hence current inside the cell is from anolde to cathode
$I=\frac{V-E}{r}$
$V=E+Ir$
Therefore, when a cell is being charged the potential difference across its terminals is greater than emf of a cell. Also in charging the positive terminal is connected to anode of the cell and negative terminal to cathode.
Here, positive terminal of the battery is connected to terminal A of charger and negative terminal of the battery is connected to terminal B of charger.
Hence, Potential difference across points A and B must be more than E, A must be at higher potential than B and In battery, current flows from positive terminal to the negative terminal