question_answer

What is the reading of voltmeter in the following figure [MP PMT 2004]

A)                    3 V

B)                    2 V

C)                    5 V

D)                    4 V

Correct Answer: D

Solution :

             Resistance between A and B \[=\frac{1000\times 500}{(1500)}=\frac{1000}{3}\]                    So, equivalent resistance of the circuit                    \[{{R}_{eq}}\]\[=500+\frac{1000}{3}=\frac{2500}{3}\] \ Current drawn from the cell  \[i=\frac{10}{(2500/3)}\]\[\]\[=\frac{3}{250}A\] Reading of voltmeter i.e. potential difference across \[AB=\frac{3}{250}\times \frac{1000}{3}=4\,V\]