A galvanometer of resistance $100\ \Omega$ gives a full-scale deflection for a current of $1\ \text{mA}$. It is turned into a voltmeter of range $0$ to $5\ \text{V}$ by connecting a suitable resistor in series with it. This voltmeter is then used to measure the voltage across one of two $5\ \text{k}\Omega$ resistors that are connected in series across an ideal $10\ \text{V}$ battery. The reading of the voltmeter is