A battery of emf E has an internal resistance 'r'. A variable resistance R is connected to the terminals of the battery. A current I is drawn from the battery. V is the terminal P.D. If R alone is gradually reduced to zero, which of the folowing best describes I and V ?

Options

A. I approaches zero, V approaches E
B. I approaches E/r, V approaches zero
C. I approaches E/r, V approaches E
D. I approaches infinity, V approaches E

Answer

B

Explanation

The current drawn from the battery is
`I=(E)/(R+r)`
? The terminal potential difference is `V=IR`
When `Rto,Ito(E)/(r)`
When `Rto0,Vto 0`