A student sets up the circuit shown below to investigate the properties of a thermistor at a specific temperature.
During the experiment, the ammeter reads 180 μA180\ \mu\text{A}180 μA. What is the current flowing through the circuit at point X?
1.8×10−6 A1.8 \times 10^{-6}\text{ A}1.8×10−6 A
1.8×10−4 A1.8 \times 10^{-4}\text{ A}1.8×10−4 A
1.2×10−5 A1.2 \times 10^{-5}\text{ A}1.2×10−5 A
0.60 A0.60\text{ A}0.60 A