Question

Internal resistance of a battery of 2volt terminal voltage is 0.2 ohm and current following through it is 0.5A.So emf of the battery will be:

• A. $1.9V$
• B. $3V$
• C. $2V$
• D. $2.1V$

Answer 1

The correct option is D $2.1V$

From the figure,

The voltage drop across the internal resistance,

$V_i=ir=0.5\times 0.2=0.1V$

Emf, $e=V+V_i$

$e=2+0.1=2.1V$

The correct option is D.