When a galvanometer is converted into an ammeter, it is connected in parallel with a low resistance. This is because an ammeter is used to measure current, which is the flow of charge through a circuit. In order for an ammeter to accurately measure the current, it needs to have a very low resistance.
Option 1, which suggests connecting a low resistance in series, is incorrect. Connecting a low resistance in series with a galvanometer would increase the overall resistance of the circuit, making it difficult for the current to pass through and therefore affecting the accuracy of the ammeter.
Option 2, which suggests connecting a high resistance in series, is also incorrect. A high resistance in series would increase the overall resistance in the circuit, which would impede the flow of current and again affect the accuracy of the ammeter.
Option 4, which suggests connecting a high resistance in parallel, is incorrect as well. Connecting a high resistance in parallel with the galvanometer would create a parallel path for current to flow, which would divert some of the current away from the ammeter, resulting in inaccurate measurements.
Therefore, option 3, which suggests connecting a low resistance in parallel, is the correct choice when converting a galvanometer into an ammeter