A student constructs the galvanic cell represented below at \(298\text{ K}\).

\[\text{Zn(s)} + \text{Cu}^{2+}\text{(aq)} \rightarrow \text{Zn}^{2+}\text{(aq)} + \text{Cu(s)}\quad E^\circ_{\text{cell}} = +1.10\text{ V}\]

The cell consists of a \(\text{Zn(s)}\) electrode in \(1.0\text{ M } \text{Zn(NO}_3)_2\text{(aq)}\) and a \(\text{Cu(s)}\) electrode in \(1.0\text{ M } \text{Cu(NO}_3)_2\text{(aq)}\), connected by an external wire with a voltmeter and a salt bridge containing \(\text{KNO}_3\text{(aq)}\). While current is flowing and the voltmeter displays \(+1.10\text{ V}\), the student removes the salt bridge from both beakers. Which of the following best predicts and explains the immediate change in the voltmeter reading?