What is the reading of voltmeter (in volts) in the following figure?

$Resistance between A and B = \frac{1000 \times 500}{(1500)} = \frac{1000}{3} Ω$

So, equivalent resistance of the circuit

$R_{eq} = 500 + \frac{1000}{3} = \frac{2500}{3} Ω$

$∴$ Current drawn from the cell

$i = \frac{10}{(2500 / 3)} = \frac{3}{250} A$

Reading of voltmeter i.e. potential difference across

$A B = \frac{3}{250} \times \frac{1000}{3} = 4 V$

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