The potential difference in open circuit for a cell is 2.2 , volt… - Vidyadip

MCQ

The potential difference in open circuit for a cell is $2.2\, volts$. When a $4\, ohm$ resistor is connected between its two electrodes the potential difference becomes $2\, volts$. The internal resistance of the cell will be .............. $ohm$

A
$1$
B
$0.2$
C
$2.5$
✓
$0.4$

✓

Answer

Correct option: D.

$0.4$

d
$(4 + r)i = 2.2$ ...... $(i)$

and $4i = 2$ $ \Rightarrow $ $i = \frac{1}{2}$

Putting the value of $i$ in $(i)$, we get $r = 0.4\, ohm$.

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