Answer: The meter will read a negative voltage.
Explanation: If you're referring to a voltmeter, which measures the potential difference (voltage) between two points in an electrical circuit, if the positive lead is attached to the negatively charged area (lower potential) and the negative lead is attached to the positively charged area (higher potential), the meter will typically read a negative voltage.
This negative reading doesn't mean that the actual voltage is negative, but rather it indicates that the leads are reversed. The magnitude of the reading would still be the same, but the sign would be opposite.
For example, if there is a potential difference of 5 volts between the two points, with the point attached to the positive lead being at a lower potential, the voltmeter would read -5 volts. The negative sign is indicative of the direction in which current would flow if the two points were connected, which is from the point of higher potential to the point of lower potential.