Question

e) According to this diagram, the potential difference across the terminals is (Internal resistance of cell = r)

(1) V=E-ir
() V=E+ ir
(3) V=E
(4) Zero​

Answer 1

Given:

A cell with internal resistance r, EMF is E and terminal potential difference is V.

To find:

Relation between V and E.

Calculation:

We can see that current i is flowing towards the positive potential of the cell. Hence this is a case of CHARGING OF CELL.

For a cell to get charged , the terminal potential difference has to be greater as compared to the EMF of the cell.

Hence , considering the potential drops between 2 points :

$\therefore \: V = E + (i \times r)$

$= > V = E + ir$

So , final answer is :

$\boxed{ \red{ \bold{ V = E + ir}}}$