What is the reading of voltmeter in the following figure?

Make sure the voltmeter is connected in parallel across the component. The reading will depend on the circuit configuration and the applied voltage.

Without the actual figure, it’s hard to give a precise answer. Typically, a voltmeter measures potential difference (voltage) across two points in a circuit.

For general reference, check out this guide: Basic Electronics Voltmeter Use.

If you provide the figure, I can calculate the exact voltage using Ohm’s law and series-parallel rules.