First slide

voltmeter

Question

What is the reading of voltmeter in the following figure?

Moderate

A

3 V
B

2 V
C

5 V
D

4 V

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 or potential difference across
$AB = \frac{3}{250} \times \frac{1000}{3} = 4 V$

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