To convert a galvanometer to a voltmeter, a high resistance is connected to it in series. A galvanometer is an instrument used to measure small electric currents. It works by measuring the deflection of a coil of wire in a magnetic field. A voltmeter, on the other hand, is used to measure voltage or potential difference in a circuit. To convert a galvanometer to a voltmeter, we need to add a resistor in series with the galvanometer. The resistor will increase the overall resistance of the circuit, which will reduce the current flowing through the galvanometer. This is important because a galvanometer is designed to measure small currents, and if too much current flows through it, it can be damaged. By adding a resistor in series with the galvanometer, we can create a voltage divider circuit. The voltage drop across the resistor will be proportional to the voltage drop across the entire circuit, which includes the galvanometer. By choosing the appropriate value for the resistor, we can scale the voltage drop across the galvanometer to the desired level, allowing us to use the galvanometer as a voltmeter. The resistor used should have a high resistance, typically on the order of thousands or millions of ohms. This is because we want to minimize the amount of current flowing through the galvanometer while still allowing enough current to flow to make a measurement. Connecting a low resistance in series or a high resistance in parallel will not work to convert a galvanometer to a voltmeter because these configurations will not create a voltage divider circuit that scales the voltage drop across the galvanometer to the desired level. Therefore, the correct answer is high resistance is connected to it in series.