A student constructs a galvanic cell using a zinc electrode in a solution of \(1.0\text{ M }\text{Zn(NO}_3)_2\text{(aq)}\) and a copper electrode in a solution of \(1.0\text{ M }\text{Cu(NO}_3)_2\text{(aq)}\). The half-cells are connected by an external wire through an ammeter and a salt bridge containing \(\text{KNO}_3\text{(aq)}\). The ammeter registers a steady positive current. If the student removes the salt bridge while keeping the wire connected, which of the following best describes the change in current and the explanation for that change?