Question

The e.m.f. of a cell is E volts and internal resistance is r ohm. The resistance in external circuit is
alsor ohm. The p.d. across the cell will be
1) E/2
2) 2E
3) 4E
4) E/4​

Answer 1

Answer:

1) E/2

Explanation:

given:

emf= E

internal resistance= r

external resistance=r

let potential difference across the ends be v

formula:

internal resistance= ((emf/ v )-1)* external resistance

thus, r= ((E/v)-1)*r

=> r/r=E/v -1

=> 1= E/v -1

=> 1+1=E/v

=>2=E/v

=> v= E/2

hence the pd = E/2

hope this helps buddy, please do mark me as the brainliest!