A cell having an emf E and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by

Options

A.
B.
C.
D.

Answer

1

Explanation

As `V=E=Ir=(ER)/(R+r)=(E)/(1+(r)/(R))`
for R=0:V=0
and for `R=oo:V=E`